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Buffer Solution Chemistry: Practice Questions and Solutions, Exams of Chemistry

Chamberlain College of NursingChemistry

A series of questions related to buffer solutions, focusing on their preparation, function, and behavior under dilution. It covers essential concepts such as the henderson-hasselbalch equation, ph calculations for acetic acid and sodium acetate solutions, and the impact of dilution on buffer ph and capacity. The questions also explore the effects of adding strong acids (hcl) and bases (naoh) to buffer solutions, requiring calculations of ph changes and volume adjustments. These exercises are designed to enhance understanding of buffer systems and their applications in maintaining stable ph levels in chemical and biological systems. A practical approach to mastering buffer solution chemistry through problem-solving.

Typology: Exams

2024/2025

Available from 08/05/2025

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Buffer Solution Questions with complete solution 2025
1.
What are buffers
How are they
made How do
they work
How does diluting
affect it?
Resist changes in
pH
Conj. a/b pair
Strong species push conj. one way
Diluting decreases buttering
capaci-
ty, but nothing on pH
2. pH buffer equation?
pH=
pKa
+
log([A-]/[HA])
3.
Calculate the pH of the stock acetic
acid solu- tion
pKa = 4.75
Conc. = 1.009M
4. Calculate the pH of stock sodium acetate
solu-
tion
Conc. = 1.017M
5.
Why would stock be more acidic than
theoreti- cal?
6.
Calculate the pH of the undiluted
buffer pKa = 4.75
[CH3COONa] = 1.017M, 100mL
[CH3COOH] = 1.009M, 100mL
CO2
dissolves
pf3
pf4

Partial preview of the text

Download Buffer Solution Chemistry: Practice Questions and Solutions and more Exams Chemistry in PDF only on Docsity!

1 /

  1. What are buffers How are they made How do they work How does diluting affect it? Resist changes in pH Conj. a/b pair Strong species push conj. one way Diluting decreases buttering capaci- ty, but nothing on pH
  2. pH buffer equation? pH= pKa + log([A-]/[HA])
  3. Calculate the pH of the stock acetic acid solu- tion pKa = 4. Conc. = 1.009M
  4. Calculate the pH of stock sodium acetate solu- tion Conc. = 1.017M
  5. Why would stock be more acidic than theoreti- cal?
  6. Calculate the pH of the undiluted buffer pKa = 4. [CH3COONa] = 1.017M, 100mL [CH3COOH] = 1.009M, 100mL CO2 dissolves

2 / pKa = 4. 40mL of undilted buffer was taken and diluted to 100mL and added to another of the same

  1. Calculate the pH of the 1: buffer pKa = 4. 20mL of the 1:5 buffer was taken and diluted to 100mL and added to another
  2. Does dilution affect buffer pH? what influences? No, lowers BC but not pH since ratio is same. Self ionization of water eq increases in significance
  3. Calculate the volume of 3M NaOH needed to change the pH of 75mL undiluted buffer by 1 pKa = 4. [CH3COONa] = 1.017M, 100mL [CH3COOH] = 1.009M, 100mL
  4. Calculate the pH of 75mL undiluted buffer after the addition of 1mL 3M NaOH
  5. Calculate the pH of the 1:5 buffer

4 / nCH3COOH = 0. nCH3COO- = 0.

  1. Calculate the pH of 75mL undiluted buffer after the addition of 15mL 3M NaOH nCH3COOH = 0. nCH3COO- = 0.
  2. Calculate the volume of 3M HCl needed to change the pH of 75mL undiluted buffer by 1 nCH3COOH = 0. nCH3COO- = 0.
  3. Calculate the pH of 75mL undiluted buffer after the addition of 5mL 3M NaOH