Based on the law of conservation of mass, the reading of the balance will be 200.0 g.
What will be the reading of the balance after the chemical is completely burnt?According to the law of conservation of mass, matter cannot be created nor destroyed but can change from one from to another.
In the given experiment, the chemical is placed on a balance in an airtight container and weighed bore it was ignited and allowed to burn completely. This means that the reaction occurred in a closed system, such that matter is not being exchanged with the surrounding.
The reading obtained in the balance before the reaction took place took into account the amount of air present in the container.
Therefore, no change in the reading of the balance will be observed and the balance will read 200.0 g.
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Sheets composed of two layers of amphipathic molecules arranged with the hydrophilic groups on the surface and the hydrophobic groups buried in the center that form in water are called?
The hydrophobic groups buried in the center that form in water are called bilayer membranes
What is a bilayer in chemistry?The lipid bilayer (or phospholipid bilayer) may be a thin polar membrane made of two layers of lipid molecules. These membranes are flat sheets that form endless barrier around all cells
What does bilayer membrane do?The purpose of the bilayer membrane is to separate the cell contents from the outside environment. the surface of the cell is mostly water and the inside of the cell is mostly water
Why is cell wall a bilayer?A cell wall is a bilayer because it is made up of 2 layers of lipids. The heads of the lipids are faced towards the opposites sides (the inside and out of doors of a cell) while the tail (the 2 fatty acids) are inside the layer facing each other
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Flammability, and the ability to corrode, are examples of
F properties of noble gases
G physical properties
H physical changes
J chemical properties
Flammability, and the ability to corrode, are examples of J chemical properties.
Flammability a chemical property :The ability of a chemical to burn or ignite, resulting in fire or combustion, is referred to as flammability. Fire testing determines the degree of difficulties involved required to cause a chemical to burn. Materials are typically classified as highly flammable, flammable, or non-flammable.
Chemical properties :A chemical property is any property of a material that emerges during or after a chemical reaction; that really is, any quality that can only be established by changing a substance's chemical identity. A chemical property is the ability or inability to change one type of matter into another. Chemical properties involve flammability, toxicity, acidity, reactivity (of various kinds), and heat of combustion.
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How do renewable and nonrenewable resources differ?
Natural resources are those that are accessible without human intervention. Like the sun, the atmosphere, the air, the water, the land, the mines, the vegetation, and animal life.
There are two categories of natural resources: renewable resources and non-renewable resources.Renewable resources :
These are the kind of natural resources that, even after constant use, do not become exhausted or depleted.For example, Wind and SunlightThese have low carbon footprints and low carbon emissions.Infrastructure costs for the production of renewable energy are very costly.Doesn't cause Pollution. Cause Pollution when usedNon Renewable resources :
These are the natural resources that, as a result of ongoing human usage, become exhausted or depleted and are neither renewed nor replaced.For example, groundwater, fossil fuels, and mineral ores etc.These emit more carbon than other, which increases their carbon footprint.Infrastructure costs for the production of energy from these resources are low.Learn more about natural resources here:
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Acids help digest proteins by: group of answer choices neutralizing them false partially denaturing them true preventing their absorption false cleaving pepsinogen true
Neutralizing them: FALSE.
What does denature mean?Some proteins in food denature when it is cooked. Because of this, cooked flesh solidifies and boiled eggs become hard. Egg whites, which are normally primarily egg albumins in water, are a famous example of denaturing in proteins. Egg whites are clear and liquid right out of the eggs.As a result of denaturation, many of the weak connections or bonds (such as hydrogen bonds) that give proteins their highly organized structure in their native (natural) state are broken. Most denatured proteins are insoluble and have a looser, more erratic structure.When part of the hydrogen bonds in a protein are broken, the protein loses some of its natural structure and becomes denatured. When weak hydrogen bonds are subjected to an acid or too much heat, they will break (like citric acid from lemon juice).Denaturation is the process that results in a protein losing its structure. Denaturation is typically brought on by the protein being subjected to external stressors such solvents, inorganic salts, exposure to acids or bases, and heat.Acids hp in the digestion of proteins by ;
NEUTRALISING THEM: FALSE.
PARTIALLY DENATURATING THEM: TRUE beacuse acids denature proteins and make them to lose their activity
PREVENTING THEIR ABSORPTION: FALSE
CLEAVING PEPSINOGEN:: TRUE pepsinogen os cleaved and then converted into active pepsin, which converts proteins into peptones and peptides.
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what is the mass (in grams) of chlorine required to react with 10.0 g of sodium metal to produce sodium chloride?
The mass of chlorine required to react with 10.0 g of sodium metal to produce sodium chloride is 15.26 g.
The balanced chemical reaction is :
2Na + Cl₂ → 2NaCl
Given data :
Mass of sodium = 10.0 g
Number of moles of Na -
Number of moles = Given mass
Molar mass
Number of moles = 10.0 g = 0.43 mol
23 g
Comparing moles of Na and Cl₂ from the balanced chemical equation,
Na : Cl₂
2 : 1
0.43 : 1 x 0.43 = 0.215 mol
2
Mass of chlorine gas :
(molar mass of chlorine = 71 g)
Mass of chlorine = number of moles x molar mass
Mass = 0.215 mol x 71 g/mol
= 15.26 g
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Which compound could not be made by the alkylation of ethyl acetoacetate, followed by decarboxylation?
Alkylation of ethyl acetoacetate followed by decarboxylation could not produce base.
What is alkylation?
By nucleophilic assault on a haloalkane, the conjugate base is alkylated. The alkylated acetoacetate is hydrolyzed, which causes the keto acid to be decarboxylated and produces a ketone. The alkylated malonate ester undergoes hydrolysis, which results in the diacid's decarboxylation and acid's production.
Alkylation is a chemical process whereby an alkyl group is added to or substituted onto a molecule of an organic substrate. Alkane molecules without hydrogen atoms are referred to as alkyl groups. For instance, the removal of a hydrogen atom from methane produces methyl groups, the most basic type of alkyl.
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allows oxidation of co (carbon monoxide) to less-harmful co₂ (carbon dioxide) allows oxidation of hc (unburned hydrocarbons) to co₂ (carbon dioxide) and h₂o (water)
The oxidation of co (carbon monoxide) to less-harmful co₂ (carbon dioxide) and the oxidation of hc (unburned hydrocarbons) to co₂ (carbon dioxide) and h₂o (water).
What is meant by an oxidation reaction?Oxidation is that the loss of electrons during a reaction by a molecule, atom or ion. Oxidation occurs when the oxidation number of a molecule, atom or ion is increased. the other process is called reduction, which occurs when there's a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.
Why is it called an oxidation reaction?
The term oxidation was first employed by Antoine Lavoisier to signify the reaction of a substance with oxygen. Much later, it had been realized that the substance, upon being oxidized, loses electrons, and therefore the meaning was extended to include other reactions in which electrons are lost, no matter whether oxygen was involved.
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Magnesium oxide decomposes into magnesium and oxygen. If 8. 06 g of magnesium oxide decomposes to form 4. 86 g of magnesium, what mass of oxygen gas is also released in the reaction?
The mass of oxygen gas released is 3.2grams.
From the above decomposition reaction, the chemical notation of reaction is given by,
2MgO = 2Mg + O₂
From above reaction, we can say that 2 moles or 80.6 grams of Mg decomposes to give 2 moles or 48.6 grams of Mg and 1 mole or 32 grams of O₂.
So 8.06 gram of MgO will give (8.06 × 32) / 80.6
= 3.2 grams of oxygen gas.
Thus the amount of oxygen gas released is 3.2grams.
Decomposition reaction occur when complex chemical entities breakdown into smaller components. Decomposition reactions often demand energy input.
The digestion of food in our bodies is a typical illustration of the decomposition response. Here, food components including proteins, lipids, and carbs will break down into a variety of easier and more compact parts.
Decomposition reaction is classified into three types, they are thermolysis, electrolysis and photolysis.
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Explain how a student would properly obtain 0.250 grams of silver nitrate from a hollow glass stoppered reagent bottle.
To obtain 0.250g of silver nitrate, we make a solution of 0.00147M of 1L.
What is a hollow glass stoppered reagent bottle?
Product has a narrow mouth and a replaceable hollow hexagonal glass stopper. Reagent bottles are borosilicate glass containers with unique glass stoppers on top. They are also known as media bottles or graduated bottles. They are designed to hold chemicals for laboratories in liquid or powder form, where they will be housed in cabinets or on shelves.
Mass of silver nitrate (solute): 0.250g
Moles of silver nitrate: 0.00147
Molarity of the solution: 0.00147M
So to obtain 0.250g of silver nitrate, we make a solution of 0.00147M of 1L.
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If a reaction takes several days to occur without an enzyme how quickly can it occur with an enzyme.
If a reaction takes several days to occur without an enzyme it can occur in a few seconds with an enzyme.
What are enzymes?
Enzymes are proteins that hasten chemical reactions and act as biological catalysts. Substrates are the substances that interact with enzymes, and the enzyme changes the substrates into products, which are other molecules. The majority of cellular metabolic activities must use enzyme catalysis to go forward at rates fast enough to sustain life. An enzyme is a type of biological catalyst that is typically always a protein. It quickens a certain chemical process in the cell. During the reaction, the enzyme is continuously used and is not destroyed.
Thus, If a reaction takes several days to occur without an enzyme it can occur in a few seconds with an enzyme.
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select all the true statements. the k k ion is formed when a potassium atom loses one electron. when an atom gains an electron, it becomes a cation. the fe2 fe2 and fe3 fe3 ions have the same number of protons. the cu cu and cu2 cu2 ions have the same number of electrons. the cl−cl− and br−br− ions have the same number of electrons. anions carry a positive charge.
The true statements are: the K⁺ ion is formed when potassium loses one electron.
The Fe⁺² and Fe⁺³ ions have same number of protons.
1) The K⁺ ion is formed when potassium loses one electron.
When an atom loses one electron then it gets a positive charge on it that is why statement 1 is correct.
2) When an atom gains an electron, it becomes a cation.
When an atom gains an electron it becomes an anion so statement 2 is incorrect.
3) The Fe⁺² and Fe⁺³ ions have same number of protons.
Whenever an atom loses or gain electrons then they get charge on them but that changes the number of electrons present in it and not the number of protons in them. So, statement 3 is correct.
4) The Cu and Cu²⁺ ions have the same number of electrons.
When an atom gains electrons then the number of electrons in it changes. So, statement 4 is incorrect.
5) The Cl⁻ and Br⁻ ions have the same number of electrons.
They do not have same number of electrons so it is incorrect.
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A radioactive substance has a half-life of 5,000 years. if the original sample contained 20 grams of the radioactive isotope, how much remains after 5,000 years have elapsed?
The answer would be 25% remains left i.e., a radioactive substance has a half life of 5000 years, if the original sample contained 20 grams of the radioactive isotope, 25% will remains after 5000 years elapsed.
In this question (t1/2) is 5000 years , which refers that after 5000 years is half of the sample would have decayed and half would be left as it is.
Given , 20 g sample .
After 5000 years ( first half life) 20/2 = 10 g decays and 10 g remains left.
Two half lives or 5000 years 10 /2 = 5 g decays and 2.5 g remains left .
so we started with 20 g and after 5000 years 5 g of the sample will be left not decayed.
Percentage of sample left = mass of sample left x 100 / original mass of sample
Percentage of sample left = 5 g x 100 / 20g = 25 %
In conclusion, 25% remains after 5000 years have elapsed.
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A silver coin and a gold coin each have a mass of
exactly 6.6 grams. The specific heat of silver is
0.235 J/g•°C, and the specific heat of gold is
0.130 J/g-°C. Which coin requires more heat to raise its
temperature by 40°C?
The unit of measurement for specific heat is Joules per g times degree Celsius.
Similar to density, color, etc., specific heat is an intense feature that is independent of the amount of a substance present. This enables the use of heat specificity to identify compounds.
q = mcT, where q is the quantity of heat applied, m is the mass of the substance, c is its specific heat, and T is the temperature change.
Therefore, we can simply isolate the term in the calculation above to get c=qmT if we wish to find the units for specific heat.
We may calculate that c = JgC since heat is measured in Joules (J), mass in grams (g), and degree Celsius (C).
As a result, the unit of measurement for specific heat is Joules per g times degree Celsius.
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To properly measure 20 ml of water, what must be at the 20 ml mark of the graduated cylinder?
To properly measure 20 ml of water, the 20 ml mark of the graduated cylinder must be at the meniscus.
We measure at the meniscus for what reason?
To have the "actual" volume be what is marked, the mark must be placed where the bottom of the meniscus should be on the glass. Therefore, by taking measurements from the bottom of the meniscus, you are harmonizing your measurement process with the method used to calibrate the markings on the glass in the first place.
The meniscus is what?
When a molecular substance (water, of course) comes into contact with another material, the surface forms a meniscus. You may imagine that happening with water when it adheres to the interior of a glass.
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What is a product that is produced by both fermentation reactions (lactic acid fermentation or ethanol fermentation) and the electron transport chain?
The product that is produced during fermentation reactions (lactic acid fermentation or ethanol fermentation) and the electron transport chain is NAD+.
Throughout the process anaerobic glycolysis the two molecules of NADH that are bring back to their oxidized form NAD+ in the method of the fermentation. So the reclamation of glycolysis-related NADH is filled up. The method of aerobic respiration produces six molecules of NADH that being bring back into NAD+ form throughout the process of oxidative phosphorylation.
Fermentation abide by the glycolysis in the absenteeism of oxygen. Alcoholic fermentation generates ethanol, carbon dioxide, and NAD+. Lactic acid fermentation generates lactic acid (lactate) and NAD+.
Hence, in the conclusion NAD+ will be produced.
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How many neutrons are produced in the reaction? express your answer as an integer.
After completing the reaction, the number of neutrons generated is 2 neutrons.
What are neutrons in an atom of the reaction?
The neutron is an elementary particle that goes by the letters n or n0. It has a neutral charge—one that is neither positive nor negative—and a mass that is somewhat higher than that of a proton. Protons and neutrons make up the atom's nucleus. Due to their comparable functions inside the nucleus and masses of around one atomic mass unit, protons and neutrons are both referred to as nucleons.
Neutron generators, research reactors, and spallation sources are examples of dedicated neutron sources that generate free neutrons for use in neutron scattering and irradiation investigations.
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Graphing Periodic Properties
-somebody please help me out with this please
By graphing periodic properties we can identify that which compounds lies in which period or group and what are their properties.
What is Periodic Table?The periodic table is a formation of all the elements which are very well known to man according to their increasing atomic number and their chemical and physical properties.They are arranged in a tabular arrangement in form of a row (also known as period) and a column (also known as group). Elements are arranged very well from left to right and from top to bottom of their increasing atomic number.Elements in the same group consist of same valence electron arrangement and therefore having, similar type of chemical properties.The first 94 elements which are present in the periodic table are generally naturally occurring.the rest from 95 to 118 will have only which being formed in laboratories or nuclear reactors.' Mendeleev Periodic Table:Dimitri Mendeleev, which is commonly known as the father of the periodic table put from forth the first iteration of the periodic table similar to the one we use now. Mendeleev created his periodic table on the basis of increasing number of atomic mass, whereas, in the modern periodic law it says according to based on the increasing order of atomic numbers.Mendeleev’s Periodic Table was published in the German journal in 1869.In, modern periodic table , we can able to identify the no. of electron an atom can fill .helps in giving the position of players . their role , physc chemical properties.
Thus, from the above conclusion we can say that, by graphing periodic properties we can identify that which compounds lies in which period or group and what are their properties.
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A 2-lb sample of an unknown liquid occupies a volume of 62.6 in3. for the liquid determine (a) the specific volume in ft3/lb and (b) the density in lb/ft3
The specific volume of the sample is 0.018 ft³/ lb. And the density of the sample is 55.5 lb/ ft³.
A specific volume of a substance is defined as the ratio of its volume to its mass. It is the reciprocal of the density of a substance. Whereas density is defined as the ratio of the mass of the substance to its volume. SI unit of specific volume is m³ per kg. SI unit of density is kg / m³.
The mass of the sample = 2 lb
The volume of the sample = 62.6 in³
The specific volume of the sample is,
[tex]Specific\ volume = \frac{mass}{volume}\\\\Specific\ volume = \frac{V}{M}[/tex]
[tex]Specific\ volume = \[\frac{62.6}{2\times {{\left( 12 \right)}^{3}}}\]\[/tex]
[tex]Specific\ volume = 0.018\ ft^{3}/lb[/tex]
The specific volume of the sample is 0.018 ft³/ lb.
The density is the inverse of specific volume.
So, the density of the sample is,
[tex]Density = \frac{1}{specific\ voume}\\\\Density = \frac{1}{0.018} \\\\Density = 55.5\ lb/ft^{3}[/tex]
Thus, the density of the sample is 55.5 lb/ ft³.
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A cinder block sits on a platform 20 m high. If it has a mass of 8 kg, find its energy.
Answer:
1568 Joules
Explanation:
MGH
Mass of 8kg time Gravity of 9.8 and Height of 20 meters
20*9.8*8
Answer: potential energy = mgh
8×20×10=1600joules
Explanation:
The chemical potassium bicarbonate is used in club soda for taste. it is made up of potassium, carbon, hydrogen and oxygen, this is an example of?
The flavoring agent in club soda is the chemical potassium bicarbonate. This is an illustration of an emergent property because it is composed of potassium, carbon, hydrogen, and oxygen.
What is an emergent property?
An entity acquires an emergent attribute as it integrates into a larger system. Living things benefit from emergent qualities that enable them to survive by better adjusting to their surroundings.
By joining together to form the proteins, lipids, carbohydrates, and nucleic acids that comprise macromolecules, atoms like carbon, hydrogen, oxygen, and nitrogen found in molecules acquire new or emergent capabilities. Lipids are created, for instance, when particular combinations of carbon, hydrogen, and oxygen occur. Lipids have the ability to create cell membranes, which keep living cells isolated from their surroundings. Life could not exist without cell membranes, which are an emergent feature not present in the molecules that comprise them.
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Marathon is a 26.2-mile race that commemorates the run made by a greek soldier, pheidippides, that took place in 490 bce. how many kilometers did he run? (note: 1 mi = 1.6 km.)
Marathon is a 26.2 mile race that commemorates the run made by a Greek soldier, Pheidippides, that took place in 490 BC. He ran 41.9 kilometers.
The Greek soldier Pheidippides ran marathon of 26.2 miles.
So, the kilometers he ran -
1 mile = 1.6 km
26.2 mile = 1.6 x 26.2 km
= 41.9 km
Why marathon is 26.2 miles?
Marathon is 26.2 miles long, as, the Queen Alexandra requested the race to be started from the lawn of the Windsor Castle, for the little royals to watch and to finish the race in front of the royal box of Olympic stadium, and the distance between lawn of castle and royal box was 26 miles and 385 yards.
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Answer:
41.9 km
Explanation:
I took the test.
The ion [co(nh3)6]2 is octahedral and high spin. is the cobalt ion paramagnetic or diamagnetic?
The cobalt ion is paramagnetic.
The shape of compounds with six atoms or groups of atoms or ligands symmetrically grouped around a central atom, defining the vertices of an octahedron, is described by octahedral molecular geometry, also known as square bipyramidal, in chemistry.
High spin electrons will occupy the d orbitals as if they were degenerate when Δ is small because the pairing energy is greater than the splitting energy. How little or huge is Δ also depends on the metal's oxidation state.
[Co(NH₃ )₆ ]⁺ Due to the existence of an unpaired electron and a high field ligand, the ion 2+ exhibits paramagnetic behavior (low-spin complex). Co is a d⁷ electron system since it is in the +2 oxidation state in this instance. All electrons pair together in the presence of a strong ligand, leaving one electron unpaired.
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A cinder block sits on a platform 20 m high. If it has a mass of 8 kg, find its energy.
There is a cinder block on a 20-meter-high platform. If it has a mass of 8 kg The energy is 1568 joules.
What do you mean by mass?a numerical representation of the fundamental characteristic of all matter, inertia. In essence, it's the resistance of a mass of matter to changing its direction or speed in reaction to the application of a force. The more mass a body possesses, the smaller the change that is brought about by an applied force.
How would you measure mass?The formula F = m a, where F is force, m is mass, and an is acceleration, can be used to calculate mass. Determine the force, which is equivalent to weight, the acceleration, which is equivalent to gravity, and the mass.
Calculation:mass= 8 kg
height= 20 m
acceleration= 9.8
The energy can be calculated as follows
= mgh
= 8×9.8×20
= 1568
The energy is 1568 joules.
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On which object will Earth’s gravity act with the greatest magnitude?(1 point)
a banana
a banana
a television
a television
a toaster
a toaster
a piano
on which object will earth gravity act with the greatest magnitude?
ANSWER
a piano
The ______________________ is used to detect an increase in ph from 4.4 to 6.0 as mixed acids are further catabolized to form the neutral product ________________.
As mixed acids continue to be catabolized to produce the neutral product, the methyl red test is used to gauge the pH shift from 4.4 to 6.0.
The pH scale is used to determine an aqueous solution's acidity or basicity. Historically, pH stood for "potential of hydrogen" (or "power of hydrogen"). In comparison to basic or alkaline solutions (solutions with higher concentrations of H+ ions), acidic solutions have lower pH values measured.
The hydrogen ion concentration in the solution is inversely proportional to the pH scale's logarithmic scale. The origin of the pH scale can be traced to a collection of standard solutions whose pH has been established by consensus on a global scale. Utilizing a concentration cell with transference, the primary pH standard values are computed by measuring the potential difference between a hydrogen electrode and a standard electrode, such as the silver chloride electrode.
Methyl red is a pH indicator with a pKa of 5.1; it is red at pH values below 4.4, yellow at pH values over 6.2, and orange at pH values in the middle. As potential boosters of the sonochemical annihilation of chlorinated hydrocarbon contaminants, murexide and methyl red are being studied.
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draw every enol and enolate ion that can arise from the given carbonyl compound. draw the oxyanion species; do not draw carbanion resonance forms.
The diagram is in the given picture. Ketones are more reactive towards the base than aldehydes.
On using a base, the bottom abstracts a proton from alpha hydrogen to form a carbanion. Carbanion formed is stabilized because the negative charge formed participates in resonance with the carbonyl group.
What is the carbonyl group?
A group consists of a double bond linking a carbonyl carbon atom and a carbonyl oxygen atom. The carbonyl oxygen atom shares two of its six valence electrons with the carbonyl atom. Its remaining four valence electrons remain as two sets of electron lone pairs.
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comparative analysis of binary similarity measures for compound identification in mass spectrometry-based metabolomics
Analyze the effectiveness of binary similarity techniques for identifying compounds in untargeted metabolomics.
What is mass spectrometry metabolomics?
Many thousands of metabolite characteristics can be simultaneously detected and quantified using mass spectrometry-based metabolomics methods. However, because of the metabolome's chemical complexity and wide dynamic range, compound identification and accurate quantification are far more difficult.
Many thousands of metabolite characteristics can be concurrently detected and quantified using metabolomics technologies based on mass spectrometry. Due to the metabolome's chemical complexity and dynamic range, molecule identification and accurate quantification are, nonetheless, extremely challenging tasks.
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A chemist did an experiment to find out if fluorine reacts with xenon. The two gases
were mixed in a glass container. The only product detected was silicon fluoride.
Explain what happened.
When a chemist did an experiment to find out if fluorine reacts with xenon. The two gases were mixed in a glass container. The only product detected was silicon fluoride because fluorine reacted with silicon from glass.
All of the halogens strongly react with silicon to generate silicon tetrahalides. In order to create silicon(IV) fluoride, it combines with the elements fluorine (F2).Silicon tetrafluoride, also known as tetrafluorosilane, is a chemical compound having the formula SiF4.
The small liquid range of this colorless gas is noteworthy; the difference between its melting and boiling points is only 4°C. It was initially created in 1771 by Carl Wilhelm Scheele, who dissolved silica in hydrofluoric acid. John Davy later created it in 1812. Silicon tetrafluoride is a corrosive, tetrahedral molecule.
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If two versions of the same element have different numbers of electrons, at least one must be an ________;
If two versions of the same element have different numbers of electrons, at least one must be an ion.
Isotopes are the atoms of same element that have different number of neutron in them but same number of protons and electrons in them.
Isobars are the elements of different elements having same mass number but different atomic number.
But if the elements are same and the number of protons and neutrons are same but they have different number of electrons in them then they are atoms and ions.
Ions can be divided into cations and anions.
If the number of electrons in the ion is more than the number of electron in its atomic form then it forms an anion.
If the number of electron in the ion is less than the number of electrons in its atomic form then it forms a cation.
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What is the molar solubility of fe(oh)3 in a solution that is buffered at ph 2.50?
Molar solubility of Fe(oh)3 in a solution that is buffered at pH 2.50 is 2.0×10−3M.
What is solubility product constant?A salt compound will dissolve in the liquid water by forming an aqueous solution of its constituent ions. The saturated solution has compound dissociation reaction in a solubility equilibrium and we define this state using the compound's solubility product constant Ksp . This parameter will only change with solution temperature. In contrast, compound's molar solubility limit in the saturated solution can be manipulated in numerous other methods. One example involves trying to dissolve an acidic/basic salt compound in a solution that is buffered at certain pH. The pH will control compound's molar solubility because it affects the molarity of the acidic/basic constituent ion in the solution.
How can we solve it?Iron (III) hydroxide has following solubility equilibrium for its saturated solution with the given constant value:
Fe(OH)3(s)⇋Fe3+(a q)+3OH−(a q)
Ks p=6.3×10−38=[Fe3+][OH−]3
From the given pH we find hydroxide ion molarity:
pH=2.50
pOH=14.00−2.50=11.50[OH−]=10−pOH=10−11.50=3.2×10−12 M
It is assumed that the iron (III) hydroxide makes a negligible contribution to hydroxide ion molarity. We solve the expression for molar solubility of this compound x:
Ksp=6.3×10−38=(x)(3.2×10−12 M)3
x=2.0×10−3M
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