1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
monitta
3 years ago
13

Calculate the pH during the titration of 20.00 mL of 0.1000 M HNO2(aq) with 0.1000 M KOH(aq) after 13.27 mL of the base have bee

n added. Ka of nitrous acid = 7.1 x 10-4.
Chemistry
1 answer:
Slav-nsk [51]3 years ago
4 0

Answer:

pH = 2.462.

Explanation:

Hello there!

In this case, according to the reaction between nitrous acid and potassium hydroxide:

HNO_2+KOH\rightarrow KNO_2+H_2O

It is possible to compute the moles of each reactant given their concentrations and volumes:

n_{HNO_2}=0.02000L*0.1000mol/L=2.000x10^{-3}mol\\\\n_{KOH}=0.1000mol/L*0.01327L=1.327x10^{-3}mol

Thus, the resulting moles of nitrous acid after the reaction are:

n_{HNO_2}=2.000x10^{-3}mol-1.327x10^{-3}mol=6.73x10^{-4}mol

So the resulting concentration considering the final volume (20.00mL+13.27mL) is:

[HNO_2]=\frac{6.73x10^{-4}mol}{0.01327L+0.02000L} =0.02023M

In such a way, we can write the ionization of this weak acid to obtain:

HNO_2+H_2O\rightleftharpoons NO_2^-+H_3O^+

So we can set up its equilibrium expression to obtain x as the concentration of H3O+:

Ka=\frac{[NO_2^-][H_3O^+]}{[HNO_2]}\\\\7.1x10^{-4}=\frac{x^2}{0.02023M-x}

Next, by solving for the two roots of x, we get:

x_1=-0.004161M\\\\x_2=0.003451M

Whereas the correct value is 0.003451 M. Finally, we compute the resulting pH:

pH=-log(0.003451)\\\\pH=2.462

Best regards!

You might be interested in
What is the maximum number of electrons that any 'p' sublevel can hold? 2 electrons 6 electrons 8 electrons 10 electrons
Varvara68 [4.7K]
6 electrons... 's' can hold 2..... 'd' can hold 10 and 'f' can hold 14
6 0
3 years ago
Read 2 more answers
I really need help ! This is science
lina2011 [118]

Answer:

7. genetics because hereditary is not the study of hereditary.

8. is hereditary because it is the study of how things pass on to next generation what is inherited.

7 0
3 years ago
Read 2 more answers
When was the idea of a atom first devloped
bija089 [108]

Answer:

Around 450 B.C.

Explanation:

The idea was forgotten until the 1800 when John Dalton re-introduced the atom.

6 0
2 years ago
How many particles are in 1 mol of carbon? 1 mol of lithium? 1 mol of eggs? will 1 mol of each of these substances have the same
andrezito [222]
<span>One mole of a substance contains Avogadro's number of atoms/molecules/the like. This would mean that all of the items described would have approximately 6.022 * 10^23 atoms, even though their masses would differ. This would be due to the molar mass of each substance being different because of the constituent elements in the substance.</span>
8 0
3 years ago
The variable in an experiment that is changed on purpose
DiKsa [7]
The answer is Independent Variable
4 0
3 years ago
Other questions:
  • A) Calculate the average density of the following object (assume it is a perfect sphere). SHOW ALL YOUR WORK (formulas used, num
    15·1 answer
  • How does speed/velocity change
    14·2 answers
  • What reaction is depicted by the given equation:<br> Au3+ + 3e− Au
    13·1 answer
  • How many particles would one mole of NaCl have in solution​
    15·1 answer
  • 2 Equation on chemistry that I have been struggling with, needed some assistance
    8·1 answer
  • Freeeeeeeeeeee<br> Poinnnnnnntttsss
    13·2 answers
  • How many moles are in 19.82 g Mg?
    13·1 answer
  • The relation between stability and solubility​
    9·1 answer
  • Answer ASAP: what common properties do;<br> solids and liquids have<br> Liquids and gases have
    13·1 answer
  • One quarter of chlorine is chlorine-37 and the rest is Chlorine-35. Calculate the average mass of chlorine
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!