CHEM134 C002 Spring 2026| Digital
Using Buffers – Fully Solved 100% -
APUS.
SECTION 1: TEST YOUR KNOWLEDGE (Fundamental Buffer
Concepts)
1. Chemical buffers are important to industrial production and to living systems.
A) True
B) False
, Correct Answer: A
Rationale: Chemical buffers are essential in both industrial processes (e.g.,
pharmaceutical production, food preservation) and biological systems (e.g., maintaining
blood pH, cellular homeostasis). Buffers resist pH changes when small amounts of acid or
base are added .
2. The buffer capacity is the pH range that is maintained when acids and bases are
added to a solution.
A) True
B) False
Correct Answer: A
Rationale: Buffer capacity is defined as the quantity of strong acid or base a buffer can
neutralize before its pH changes significantly. It is not the pH range itself but the amount
of acid/base a buffer can absorb while maintaining pH. The statement is true .
3. Chemical buffers have specific ranges and capacities.
A) True
B) False
Correct Answer: A
Rationale: Every buffer has a specific buffer range (typically pKa ± 1) and buffer capacity
based on the absolute concentrations of the weak acid and its conjugate base. These
properties define how the buffer behaves .
, 4. Buffers are effective at resisting pH changes when large amounts of acid or base
are added to a solution.
A) True
B) False
Correct Answer: B
Rationale: Buffers are effective at resisting pH changes when SMALL amounts of acid or
base are added. When large amounts are added, the buffer capacity is exhausted, and pH
changes significantly. This is a common misconception .
5. Match each term with the best description:
Solution that resists pH changes
Compound that fully ionizes in water
Product of the ionization of an acid in water
Compound that only partially ionizes in water
Correct Answers:
Term Description
Buffer Solution that resists pH changes
Strong acid Compound that fully ionizes in water
Conjugate base Product of the ionization of an acid in water
Using Buffers – Fully Solved 100% -
APUS.
SECTION 1: TEST YOUR KNOWLEDGE (Fundamental Buffer
Concepts)
1. Chemical buffers are important to industrial production and to living systems.
A) True
B) False
, Correct Answer: A
Rationale: Chemical buffers are essential in both industrial processes (e.g.,
pharmaceutical production, food preservation) and biological systems (e.g., maintaining
blood pH, cellular homeostasis). Buffers resist pH changes when small amounts of acid or
base are added .
2. The buffer capacity is the pH range that is maintained when acids and bases are
added to a solution.
A) True
B) False
Correct Answer: A
Rationale: Buffer capacity is defined as the quantity of strong acid or base a buffer can
neutralize before its pH changes significantly. It is not the pH range itself but the amount
of acid/base a buffer can absorb while maintaining pH. The statement is true .
3. Chemical buffers have specific ranges and capacities.
A) True
B) False
Correct Answer: A
Rationale: Every buffer has a specific buffer range (typically pKa ± 1) and buffer capacity
based on the absolute concentrations of the weak acid and its conjugate base. These
properties define how the buffer behaves .
, 4. Buffers are effective at resisting pH changes when large amounts of acid or base
are added to a solution.
A) True
B) False
Correct Answer: B
Rationale: Buffers are effective at resisting pH changes when SMALL amounts of acid or
base are added. When large amounts are added, the buffer capacity is exhausted, and pH
changes significantly. This is a common misconception .
5. Match each term with the best description:
Solution that resists pH changes
Compound that fully ionizes in water
Product of the ionization of an acid in water
Compound that only partially ionizes in water
Correct Answers:
Term Description
Buffer Solution that resists pH changes
Strong acid Compound that fully ionizes in water
Conjugate base Product of the ionization of an acid in water
