Calculate the ph of a buffer solution that contains 0.25 M benzoic acid (c6h5co2h) and 0.15M sodium benzoate (c6h5coona) . Ka=6.5×10-5

Answers

Answer 1

Answer:

4.0

Explanation:

we have a buffer system formed by a weak acid (benzoic acid C₆H₅O₂H) and its conjugate base (benzoate ion C₆H₅O₂⁻, coming from sodium benzoate C₆H₅O₂Na). Given the acid dissociation constant (Ka) for benzoic acid is 6.5 × 10⁻⁵, we can calculate the pH of the buffer solution using the Henderson-Hasselbach equation.

pH =pKa + log [base]/[acid]

pH =-log Ka + log [C₆H₅O₂⁻]/[C₆H₅O₂H]

pH =-log 6.5 × 10⁻⁵ + log (0.15 M/0.25 M) = 4.0


Related Questions

A perfect cube of aluminium metal was found to weigh 20.00g ,the density of the aluminium is 2.70g/ml ,what are the dimensions of the cube

Answers

Answer:

1.95cm x 1.95cm x 1.95cm

Explanation:

20.00g / 2.70g/mL = 7.41 mL = 7.41 cm^3

∛7.41 = 1.95cm

differentiate between homogenous matter and heterogeneous matter?​

Answers

Answer:

Homogeneous mixture:

These are called solutions.It has a uniform composition.It has only one phase.It cannot be separated physically.The particles appear smaller in size.These are pure substances.These are not visible easily visible to the naked eye and also through a microscope.Examples include milk, gasoline, sugar solution, corn oil, fog, etc.

Heterogeneous mixture:

These are called suspensions/colloids.It has a non-uniform composition.There are two or more phases.It can be separated physically.The particles are either smaller or larger in size.These are not pure substances.These are easily visible to the naked eye and also through a microscopeExamples are- a mixture of mud & water, beach sand, vinegar, air cloud, etc.

Describe the De Borglie's hypothesis​

Answers

Answer:

The De Broglie hypothesis proposes that all matter exhibits wave-like properties and relates the observed wavelength of matter to its momentum. After Albert Einstein's photon theory became accepted, the question became whether this was true only for light or whether material objects also exhibited wave-like behavior.

For each of the salts below, match the salts that can be compared directly, using Ksp values, to estimate solubilities.

a. Mg(OH)2
b. CaSO3
c. BaCrO4
d. CaS

1. copper (II) sulfide
2. zinc hydroxide

Answers

Answer:

1 - Salts required  that can be compared directly, using Ksp values, to estimate solubilities for copper (II) sulfide are - [tex]CaSO_3[/tex] (Option b) ,[tex]BaCrO_4[/tex] (Option c) and [tex]CaS[/tex] (Option d)

2 - Salts  that can be compared directly, using Ksp values, to estimate solubilities for zinc hydroxide are - [tex]Mg(OH)_2[/tex] (Option a)

Explanation:

[tex]K_s_p[/tex] values can be used to compare the solubility of salts that produce ions in a 1:1 ratio.

[tex]CuS[/tex] {copper (II)sulfide} dissociates with ions in ratio 1:1 .

Because the salts [tex]CaSO_3[/tex] , [tex]BaCrO_4[/tex] and [tex]CaS[/tex]  have a 1:1 ion ratio, the solubilities of options b, c, and d can be compared to salt 1.

[tex]K_s_p[/tex] Values can be used to compare the solubility of salts that produce ions in a 1:2 or 2:1 ratio.

  2. [tex]Zn(OH)_2[/tex] dissociates into ions in ratio 1:2 .

Because the ions in the salt [tex]Mg(OH)_2[/tex] are in a 1:2 ratio, the solubility of salt 2 can be compared to that of salt 'a'.

Hence , Salt 1 is matched with options b , c , d.

              Salt 2 is matched with option a.

How many moles are in 67.94 liters of O2?
I need this answered asap

Answers

Answer:

3.033

Explanation:

67.94/22.4= 3.033

I hope lol

Label the states of each compound in the reaction below.
CuSO4( ) + 2KOHC ) + Cu(OH)2( ) + K2SO4( )

Answers

Answer:

CuSO₄(aq) + 2KOH (aq) —> Cu(OH)₂(s) + K₂SO₄(aq)

Explanation:

CuSO₄ + 2KOH —> Cu(OH)₂ + K₂SO₄

To know the state of each compounds, we shall determine the complete ionic equation. This can be obtained as follow:

In solution, CuSO₄ and KOH will dissociate as follow:

CuSO₄(aq) —> Cu²⁺(aq) + SO₄²¯(aq)

KOH (aq) —> K⁺ (aq) + OH¯(aq)

CuSO₄(aq) + KOH (aq) —>

Cu²⁺(aq) + SO₄²¯(aq) + 2K⁺(aq) + 2OH¯(aq) —> Cu(OH)₂(s) + 2K⁺(aq) + SO₄²¯(aq)

Note: Cu(OH)₂ is insoluble in water.

Therefore, the elemental equation is:

CuSO₄(aq) + 2KOH (aq) —> Cu(OH)₂(s) + K₂SO₄(aq)

Which two combinations will give you a TALL plant?

Answers

TT with Tt

or TT with TT

would give a tall plant

HELP ASAP CHEM!!!! Please

Answers

Answer:

The solubility of gases decreases with pressure as that of solids and liquids is not affected.

can anyone help with this mole to mole/mole to grams question? any help would be greatly appreciated! Thanks!

Answers

Answer:

Explanation:

a) 3.00 mol Cu x 2 mol Ag/ 1 mol Cu = 6 mol Ag

b) 3.00 mol Cu x 2 mol Ag/1 mol Cu x 107.87g Ag/ 1 mol Ag = 647.22g Ag

c) 3.00 mol Cu x 1 mol Cu(NO3)2/ 1 mol Cu = 3 mol Cu(NO3)2

d) 3.00 mol Cu x 1 mol Cu(NO3)2/ 1 mol Cu x 187.54g/ 1 mol Cu(NO3)2 =562.644g Cu(NO3)2

Magnesium metal reacts with hydrochloric acid to produce hydrogen gas and a solution of magnesium chloride. Write and balance the chemical equation for this reaction, and determine the volume of the hydrogen gas generated (at 1.00 atm, 25 °C) by reacting 10.0 g Mg with an excess of hydrochloric acid

Answers

Answer:

Mg + 2 HCl ⇒ MgCl₂ + H₂

10.1 L

Explanation:

Step 1: Write the balanced equation

Mg + 2 HCl ⇒ MgCl₂ + H₂

Step 2: Calculate the moles corresponding to 10.0 g of Mg

The molar mass of Mg is 24.31 g/mol.

10.0 g × 1 mol/24.31 g = 0.411 mol

Step 3: Calculate the moles of H₂ produced from 0.411 moles of Mg

The molar ratio of Mg to H₂ is 1:1. The moles of H₂ produced are 1/1 × 0.411 mol = 0.411 mol

Step 4: Calculate the volume occupied by 0.411 moles of H₂

0.411 moles of H₂ are at 1.00 atm and 25 °C (298 K). We can calculate the volume occupied using the ideal gas equation.

P × V = n × R × T

V = n × R × T / P

V = 0.411 mol × (0.0821 atm.L/mol.K) × 298 K / 1.00 atm = 10.1 L

When elements chemically combine with each other, what do they Form? A. electrons, B. compounds, C. atoms

Answers

Answer:

B

Explanation:

When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).

MARK AS BRAINLEST!!

The products of a combustion reaction always include oxygen gas and water vapor.

True
Or
False

Answers

Answer:

true

Explanation:

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant. The combustion of hydrogen gas produces water vapor. ... The products of the combustion of hydrocarbons are carbon dioxide and water.

Imagine that all microorganism suddenly disappeared from earth from what u have learned why do u think that animals would eventually disappeared from earth? Why would plant disappeared

Answers

Answer:

bugging milftoon comic milftoon comic milftoon cimicd how many to summon a transgender milftoon cimicd how

please i need help really quickly on this. thank you​

Answers

Answer:

the error could have been the fact that the unit for volume wasn't changed from cm³ to dm³

hence the calculation error

the solution to this would be first dividing the volume by 1000 to get that same amount in dm³ which is the standard unit to be used for volume-density calculations

A solution with a ph of 5 has how many more hydrogen ions in it than a solution with a ph of 7?

Answers

Because a solution of seven will be neutral and a solution having PH of five would be acidic and the acids have more hydrogen ion than a neutral solution

1. What is the composition
of Ca(No2)2

Answers

Answer:

1 Calcium, 2 Nitrogen, and 4 oxygen

Explanation:

there is no number before of after Ca(calcium), so there is only 1. No(nitrogen) has no number next to it so there would be only 1 of it,but there is a 2 after the parenthesis so there is 2 nitrogen (2*1=2). O(oxygen) has a two next to it so there would be only 2 oxygen, but there is a two after the parenthesis so instead there are 4 oxygen because 2*2=4. Hope this helped you <3

What the guy above me said bru ^

Balance the equation.
Fe + Cl2 → FeCl3
A. Fe + 3Cl2 + 2FeCl3
B. Fe + 3Cl2 → FeCl3
C. 2Fe + 3Cl2 + 2FeCl3

Answers

Answer:

C. 2Fe + 3Cl2 + 2FeCl3

Explanation:

Hello there!

In this case, according to the given chemical reaction:

Fe + Cl2 → FeCl3

It turns out possible to balance it via cross-multiplying the chlorine atoms as they do not result from a whole number multiplication; it means we get:

Fe + 3Cl2 → 2FeCl3

And we just balance Fe by placing a 2 on Fe:

2Fe + 3Cl2 → 2FeCl3

Thus, the answer is C. 2Fe + 3Cl2 + 2FeCl3  

Regards!

There is a ______that shoots out hot water every day.
Geyser
Volcano
Hot spring
Fumarole
Tectonic​

Answers

Answer:

geyser shoots out hot water everyday

Which of the following would be a correct conversion factor
relating carbon dioxide (CO2) and glucose (C6H1206) using the
balanced equation below?
6CO2 + 6H20C6H12O6 + 602

Answers

It’s d I did the test

Answer:6CO2/1C6H12O6

Explanation:

Bottle A is filled with air, and Bottle B is filled with carbon dioxide of equal temperatures. Each bottle is placed 50 cm from a heat source, and the temperature inside each bottle is recorded every 5 minutes. Which statement describes the results of the experiment after an hour?

a. The temperatures in the bottles increased equally.
b. Bottle B has a higher temperature than Bottle A.
c. Bottle A has a higher temperature than Bottle B.
d. The temperature of neither bottle increased.

Answers

Answer:

Bottle B has a higher temperature than Bottle A.

Explanation:

We have to consider something very important here and that is the ability of the molecules of CO2 and those of air to trap heat.

CO2 molecules are better able to trap heat since it is among the green house gases.

Since CO2 is a greenhouse gas, the temperature of bottle B is higher than that of bottle A because more heat is trapped by the gas in bottle B than the gas in bottle A.

How many grams of sodium chloride are in 100 mL of 1.25 M sodium chloride?

Answers

Answer:

7.3125grams

Explanation:

Molarity is the measure of the molar concentration of a solution. It can be calculated using the formula as follows:

Molarity = number of moles (n) ÷ volume (V)

Based on the information given,

Molarity = 1.25 M

Volume = 100 mL = 100/1000 = 0.1 L

Molarity = n/V

1.25 = n/0.1

n = 1.25 × 0.1

n = 0.125mol

Using the below formula to calculate the mass of NaCl;

mole = mass/molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

0.125 = mass/58.5

mass = 0.125 × 58.5

mass = 7.3125 grams

A sample of NH3 contains 10.0 grams of nitrogen and 25.00 grams of oxygen. Find its percent composition.
N= 0=

Answers

Answer:

[tex]\%N=28.6\%\\\\\%O=71.4\%[/tex]

Explanation:

Hello there!

In this case, according to the given information, it is possible to calculate the percent compositions, by dividing the mass of each element by the sum of the masses of the elements as shown below:

[tex]\%N=\frac{m_N}{m_N+m_O} *100\%\\\\\%O=\frac{m_O}{m_N+m_O}*100\%[/tex]

Thus, we plug in the given masses to obtain:

[tex]\%N=\frac{10.0g}{10.0g+25.00g} *100\%=28.6\%\\\\\%O=\frac{25.00g}{10.0g+25.00g}*100\% =71.4\%[/tex]

Regards!

What is said to have occurred when an object experiences a frequency equal to its natural frequency?
frequency


diffraction


resonance


amplitude

Answers

Answer: Resonance

Explanation:

A resonance is said to occur when an object experiences a frequency that is equal to its natural frequency.

A resonance refers to the sound that's produced by an object when the object vibrates at an identical rate as the sound waves that is coming from another object.

Therefore, the correct option is C

what is carboxylic acid

Carboxylic acids.

Answers

Answer:

Carboxylic acid is an organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid. It is  used in the production of polymers, biopolymers, coatings, adhesives, and pharmaceutical drugs. They also can be used as solvents, food additives, antimicrobials, and flavorings.

Explanation:

Hope that helps.

Which of the following are properties of mechanical waves? (pick more than 1)
A. Waves require a medium or material, to move through
B. Energy is transferred with the motion of the wave.
C. Waves begin at a source with a disturbance.
D. Particles of a medium always move perpendicular to the wave motion. ​

Answers

Answer:

I'd say ALL OF THE ABOVE.

A Mechanical wave is a disturbance that transfers energy as it moves through a medium without displacement of the medium itself.

It can Either be Transversal or Longitudinal.

It is Transversal when the particles of the medium move perpendicular to the wave motion.

It requires a medium and begin at a source with a disturbance

So

ALL THE OPTIONS SEEM LEGIT.

The forces between ________ are examples of electric forces.
A.
charged particles
B.
neutrons
C.
masses
D.
photons

Answers

Answer:

The answer would be charged particles.

Explanation:

Electric force exists as one of the most fundamental forces in the universe, it occurs between all charged particles.

Yeah I think its A too

The state of matter of a substance is a physical property. A. True B. False

Answers

Answer:

I THINK IT IS TRUE  BECAUSE THEY ERE FIRST FOUND TO DEMOCRITUS ARISTOTLE AND PLATO THE ROMANS AND GREEK CHEMISTS .

Explanation:

What are alleles? Are theys ame or different​

Answers

Answer:

Kind of like DNA or a part of DNA

Explanation:

They are what make you a person, no they aren't the same

The main criterion for sigma bond formation is that the two bonded atoms have valence orbitals with lobes that point directly at each other along the line between the two nuclei.

a. True
b. False

Answers

Answer:

The given statement - The main criterion for sigma bond formation is that the two bonded atoms have valence orbitals with lobes that point directly at each other along the line between the two nuclei , is True.

Explanation:

The above statement is correct , because the sigma bond is produced by the head on overlapping, the orbitals should all point in the same direction.

SIGMA BONDS - Sigma bonds (bonds) are the strongest type of covalent chemical bond in chemistry. They're made up of atomic orbitals that collide head-on. For diatomic molecules, sigma bonding is best characterized using the language and tools of symmetry groups.

Head-on overlapping of atomic orbitals produces sigma bonds. The concept of sigma bonding is expanded to include bonding interactions where a single lobe of one orbital overlaps with a single lobe of another. Propane, for example, is made up of ten sigma bonds, one for each of the two CC bonds and one for each of the eight CH bonds.

Hence , the answer is true .

When KCl(s) is dissolved in water, the resulting solution is classified as a
O heterogeneous compound
O homogeneous compound
O heterogeneous mixture
O homogeneous mixture

Answers

Answer:

O homogeneous mixture

Explanation:

When Kci is dissolved in water it becomes a solute in O homogeneous mixture

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