25.0cm3 of s saturated potassium hydroxide is neutralized by 35.0cm3 of hydrogen chloride acid of concentration 0.75 mol/dm3. Calculate the concentration of potassium hydroxide solution. Please help, will give brainliest, unhelpful answers will get reported.​

Answers

Answer 1

Answer:

Concentration of the original [tex]\rm KOH[/tex] solution: approximately [tex]1.05\; \rm mol \cdot dm^{-3}[/tex].

Explanation:

Notice that the concentration of the [tex]\rm HCl[/tex] solution is in the unit [tex]\rm mol\cdot dm^{-3}[/tex]. However, the unit of the two volumes is [tex]\rm cm^{3}[/tex]. Convert the unit of the two volumes to [tex]\rm dm^{3}[/tex] to match the unit of concentration.

[tex]\begin{aligned} V(\mathrm{NaOH}) &= 25.0\; \rm cm^{3} \\ &= 25.0\; \rm cm^{3} \times \frac{1\; \rm dm^{3}}{1000\; \rm cm^{3}} \approx 0.0250\; \rm dm^{3} \end{aligned}[/tex].

[tex]\begin{aligned} V(\mathrm{HCl}) &= 35.0\; \rm cm^{3} \\ &= 35.0\; \rm cm^{3} \times \frac{1\; \rm dm^{3}}{1000\; \rm cm^{3}} \approx 0.0350\; \rm dm^{3} \end{aligned}[/tex].

Calculate the number of moles of [tex]\rm HCl[/tex] molecules in that [tex]0.0350\; \rm dm^{3}[/tex] of [tex]0.75\; \rm mol \cdot dm^{3}[/tex] [tex]\rm HCl\![/tex] solution:

[tex]\begin{aligned}n(\mathrm{HCl}) &= c(\mathrm{HCl}) \cdot V(\mathrm{HCl}) \\ &= 0.00350\; \rm dm^{3} \times 0.75\; \rm mol \cdot dm^{3} \\ &\approx 0.02625\; \rm mol\end{aligned}[/tex].

[tex]\rm HCl[/tex] is a monoprotic acid. In other words, each [tex]\rm HCl\![/tex] would release up to one proton [tex]\rm H^{+}[/tex].

On the other hand, [tex]\rm KOH[/tex] is a monoprotic base. Each [tex]\rm KOH\![/tex] formula unit would react with up to one [tex]\rm H^{+}[/tex].

Hence, [tex]\rm HCl[/tex] molecules and [tex]\rm KOH\![/tex] formula units would react at a one-to-one ratio.

[tex]{\rm HCl}\, (aq) + {\rm NaOH}\, (aq) \to {\rm NaCl}\, (aq) + {\rm H_2O}\, (l)[/tex].

Therefore, that [tex]0.02625\; \rm mol[/tex] of [tex]\rm HCl[/tex] molecules would neutralize exactly the same number of [tex]\rm NaOH[/tex] formula units. That is: [tex]n(\mathrm{NaOH}) = 0.02625\; \rm mol[/tex].

Calculate the concentration of a [tex]\rm NaOH[/tex] solution where [tex]V(\mathrm{NaOH}) = 0.0250\; \rm dm^{3}[/tex] and [tex]n(\mathrm{NaOH}) = 0.02625\; \rm mol[/tex]:

[tex]\begin{aligned}c(\mathrm{NaOH}) &= \frac{n(\mathrm{NaOH})}{V(\mathrm{NaOH})} \\ &= \frac{0.02625\; \rm mol}{0.0250\; \rm dm^{3}}\approx 1.05\; \rm mol \cdot dm^{-3}\end{aligned}[/tex].


Related Questions

For the compound butane (C4H10)

a) What are the elements in the compound?

b) What are the number of atoms of each element?

c) What are the total number of atoms per molecule?

Answers

I think b not sure though
A. Carbon and Hydrogen.
B. Carbon: 6 Hydrogen: 1
C. 34

Find the percent of water in Zn3(PO4)2 x 7H2O

Answers

Answer:

24.66%

Explanation:

To find the percent of water (H2O) in the following compound: Zn3(PO4)2. 7H2O

The atomic mass of the elements are as follows:

Zn = 65g/mol

P = 31g/mol

O = 16g/mol

H = 1g/mol

Hence, molar mass of the compound is as follows:

65(3) + {31 + 16(4)} 2 + 7{1(2) + 16}

195 + 95(2) + 7(18)

195 + 190 + 126

511g/mol

Molar mass of 7H2O

= 7(18)

= 126g/mol

Hence, the percent of H2O in the compound is:

Molar Mass of 7H2O/molar mass of compound × 100

= 126/511 × 100

= 0.2466 × 100

= 24.66%

Good day please help me thank you

Answers

I think c I’m not positive about the question but I think c

Answer:

D Transportation it makes sence if it doesn't just re read it

What is the percent of Li in
Li3N?
(Li = 6.94 amu, N = 14.01 amu)

Answers

Answer:

The percentage by mass of lithium in one mole of Li₃N is approximately 59.78%

Explanation:

The given compound is Li₃N

The atomic mass of lithium, Li = 6.94 amu

The atomic mass of nitrogen, N = 14.01 amu

Therefore by definition, we have;

The mass of one mole of lithium, Li = 6.94 g

The mass of one mole of nitrogen, N = 14.01 g

One molecule of Li₃N contains 3 atoms of lithium, Li and 1 atom of nitrogen, N

The mass of one mole of Li₃N = The molar mass of Li₃N = 3 × The mass of one mole of lithium + The mass of one mole of nitrogen

∴ The mass of one mole of Li₃N = 3 × 6.94 g + 14.01 g = 34.83 g

The percentage by mass of lithium, Li, in one mole of Li₃N = 3×6.94/(34.83) × 100 ≈ 59.78%

The percentage by mass of lithium in one mole of Li₃N ≈ 59.78%.

Question 14
An element's periodic table identity is defined by its number of
А.
neutrons.
B
isotopes.
С C
electrons.
protons

Answers

Answer:

c

Explanation:

protons are the atomic number which define an element

In a lever,E×E.D.=L×__________​

Answers

Answer:

LD is a answer okkkkkkkkkkkkkkkkk

DO ANY OF YALL KNOW THIS?????

1. Why do we need to use the mole to count atoms? (2pts) 

 
2. What is the Molar mass of the following? Show your work
  a. H2O2  (4pts) 
   b. C2H6  (4pts) 

Answers

Answer:

1.mole allows us to weigh convenient amounts of material containing known numbers of atoms; i.e., it allows us to count atoms

2. H202 :34.0147 g/mol

C2H6: 30.07 g/mol

. Classify each of the organisms in Figures 2 and 3 as
herbivore, carnivore, or omnivore. Explain your
classifications.
HELLLPPPP MEEEE PLEASE

Answers

Answer:

Herbivore, Omnivore & Carnivore

Explanation:

Herbivore they eat grass, Omnivores eat fruits and vegetables & Carnivores eat meat or flesh so that's why herb then omni and last carni bc so omni and herbi eat like the same thing

Answer:

Herbivore, Omnivore & Carnivore

Explanation:

What is the condensation point and freezing point of neon in KELVIN.

Answers

Answer:

-415.5°F (-248.6°C)

Explanation:

Answer: The melting point/condensation point of neon is 24.53888889. Of course, I'm sure you can round that. The freezing point would be 521.74. All of this is in Kelvin

What do you think it means to "use safe cooking practices?"​

Answers

Using safe cooking practices means taking the proper precautions in the kitchen to avoid accidents and any injuries.

~theLocoCOco

Answer:

to be safe

Explanation:

just follow intructions and watch what u do

How much work is required to pull a sled if you use 60J of work in 5 seconds?

Answers

Answer:

DO I Look Like santa too you how am i supposed to know How about this how about you goo.gle the answer wow smart

Explanation:

calculate the ratio of molecules present in 16g of methane and 16g of oxygen​

Answers

Answer:

The ratio = 2 : 1

Explanation:

Consider the balanced equation. PCl3 + 3H2O Right arrow. H3PO3 + 3HCl What is the percent yield of HCl if 42.0 g of HCl are produced from the reaction of 62.0 g of PCl3? Use Percent yield equals StartFraction actual yield over theoretical yield EndFraction times 100..

Answers

Answer:

Percient yield of reaction: 85 %

Explanation:

The reaction is:

PCl₃ + 3H₂O → H₃PO₃ + 3HCl

We only have data from the chloride, so we assume water is in excess. We convert the mass to moles:

62 g . 1mol / 137.32 g = 0.452 mol

If ratio is 1:3, from 0.452 mol we would produce three times as big, that amount. (0.452 . 3) = 1.36 moles of HCl.

We convert the amount to mass.

1.36 mol . 36.45g / 1mol = 49.4 g

This value of produced HCl is the theoretical yield. To determine the percent yield we make:

(Yield produced / Theoretical yield) . 100

(42 g / 49.4g) . 100 = 85%

Answer:

Yes it is 85.0%

Explanation:

Which of the following is NOT a physical property?

A. melting point
B. state of matter
C. density
D. flammability

Answers

Answer:

i think.its D ddddddddddddd

Calculate the wavelength of radiation with a frequency of 4.9 ×1014 per second.
Answer in units of meters.

Answers

The wavelength-λ = 6.12 x 10⁻⁷ m

Further explanation

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves

f = c / λ

c = speed of light

= 3.10⁸  m/s

λ = wavelength

The wavelength of radiation with a frequency of 4.9 ×10¹⁴/s :

[tex]\tt \lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3.10^8}{4.9\times 10^{14}}\\\\\lambda=6.12\times 10^{-7}~m[/tex]

Please answer correctly !!!!! Will mark brainliest !!!!!!!!!!!!!!

Answers

Answer: Solids

Explanation:

In the solid state, the individual particles of a substance are in fixed positions with respect to each other because there is not enough thermal energy to overcome the intermolecular interactions between the particles. As a result, solids have a definite shape and volume.

0.190 moles cesium chloride converted to grams

Answers

Answer:

31.9881055

Explanation:

0.190*168.35=31.9881055

Help please When you are measuring your pulse (heart beats per minute) what system are you monitoring?
A. Digestive
B. Respiratory
C. Circulatory
D. Integumentary (skin)

Answers

The answer is C.Circulatory because its made up of blood vessels that carry blood away from and towards the HEART

1. Which of the following substances is believed to be responsible for the hole in the ozone
layer?
A. Ammonia
B. Chlorofluorocarbons (CFCs)
C. Lead
D. Carbon monoxide

Answers

A. Ammonia because look it up

A sample of gas is stored at 15 atmosphere and has a volume of 5 liters.If the volume of the gas is reduced to 3 liters,what will the new pressure be?

Answers

The new pressure will be : 25 atm

Further explanation

Boyle's Law  

At a constant temperature, the gas volume is inversely proportional to the pressure applied  

[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]

P₁=15 atm

V₁=5 L

V₂= 3 L

[tex]\tt P_2=\dfrac{P_1.V_1}{V_2}\\\\P_1=\dfrac{15~atm\times 5~L}{3~L}\\\\P_1=\boxed{\bold{25~atm}}[/tex]

salks vaccine trail was a double-blind experiment true or false

Answers

Answer:

true

Explanation:

IF YOU ANSWER CORRECTLY U WILL RECIVE BRAINLEIST AND 10 pts! AsAp! thank youuu u will make my day by answering CoRrEcTlY!

Answers

Answer:

6 and 8

Explanation:

How many total electrons does Fluorine have?

Answers

Answer:

nine electrons

Explanation:

Answer:

There are 9 total electrons. There is always the same number of protons and neutrons so the charge in the atom balances out. The atomic number is the number of protons, and electrons.

Explanation:

What is a biotic factor

Answers

Answer:

can be described as any living component that affects another organism or shapes the ecosystem.

Explanation:

Biotic components, or biotic factors, can be described as any living component that affects another organism or shapes the ecosystem. This includes both animals that consume other organisms within their ecosystem, and the organism that is being consumed.

What part of the atom tells you what element it is?
Number of electrons
Number of Photons (the light particle)
Number of Neutrons
Number of Protons

Answers

Answer: I believe it is the number of protons.

what is physical change and chemical change

Answers

Answer:

Physical change occur when objects or sub undergo a change that does not change their chemical composition.

Chemical change us a permanent change which occur when a substance combined with another to form a new substances.

i need so much help 50 points!!!!!! complete the graph

Answers

Where is the graph at? may you send a picture of it?

Lily took 57 seconds to walk from classroom to library. If the distance between the classroom and library was 38 m, at what average speed did Lily walk in m/min?
___ m/min

Answers

1.5 sorry if I’m wrong!

A nitrogen molecule (N2) has one triple bond. How many electrons do the nitrogen atoms share?

A. 1
B. 3
C. 4
D. 6

Answers

Answer:

3 electrons

Explanation:

20 POINTS!!
Kinetic and Potential Energy

Answers

A ball sitting on the peak of a mountain (potential) then the ball rolling down (kinetic)

Answer:

When a ball is rolled up a hill, it has potential energy that can turned into kinetic energy. The kinetic energy would be the ball rolling down the hill.

Explanation:

Hope this helps!

Other Questions
Imagine you are in charge of creating a healthy menu for your family for one day. What would you have for breakfast, lunch, dinner and a snack?In Spanish, write a list of foods for each meal. I need help on my history bellringer. help, please? Pleeeeeeeaaaaaaasssssssseeeeeee?? Measures that you would take to minimize landslides in your locality. how is Macbeth responsible for his own downfall Select the correct answer.Decide if the clause in capital letters is DEPENDENT or INDEPENDENT.The mechanic WHO FIXED MY CAR had been at the garage for six months.A.A dependent clauseB.An independent clause Help me plsss I need help Please answer this thank you Write the following in point-slope form. What did King George III place in the colonies without their permission even during times of peace?1 British coal2 British troops3 Plum pudding4 Spanish cattle Help please! I hope the given possibles help my brother is gay what is his name A polynomial function has a root of -6 with multiplicity 1, a root of -2 with multiplicity 3, a root of 0 with multiplicity 2 and a root of 4 with multiplicity 3. If the function has a positive leading coefficient and is of odd degree, which statement about the graph is true? The graph of the function is positive on (-6, -2). The graph of the function is negative on (-, 0). The graph of the function is positive on (-2, 4). The graph of the function is negative on (4,) plzzzz help me this is due today. only need help with these two questions and the element is oxygen.How do protons, neutrons, and electrons differ in terms of their electrical charges and locations within the atom?Describe the four fundamental forces. Which of these forces are involved in chemical bonding? How did some colonists show their strengths as leaders?PLS ANSWER ITS DUEE SOON solve k/2 - 2k + 1=7 SmolHumanAngel here y go Which of the following ratios is not equivalent to the other three? A 2/3 B 4/5 C 4 to 6 D 8 to 12 A parachutists rate during a free fall reaches 216 kilometers per hour. What is this rate in meters per second? At this rate, how many meters will the parachutist fall during 20 seconds of free fall? Do not round your answers. 4. Which of the following was the original reason for manuscripts?A. FarmingB. ReligionC. GovernmentD. Children's stories