Question 1

Which of the following combinations will NOT create a buffer solution?

Accepted Answer

HNO$$_3$$ and KNO$$_3$$

Question 2

A buffer solution is best described as a solution that:

Accepted Answer

Resists drastic changes in pH when small amounts of strong acid or base are added

Question 3

Which of the following is a correct way to form a buffer solution?

Accepted Answer

Mixing a weak acid and its conjugate base

Question 4

Which of the following combinations can result in the formation of a buffer?

Accepted Answer

CH$$_3CH$_2NH$_2$$ and CH$$_3CH$_2NH$_3^+$$

Question 5

A buffer solution is comprised of 50.0 mL of 0.100 M HClO$$_2$$ and 60.0 mL of 0.100 M NaClO$$_2. $$Which of the following actions would completely destroy the buffer?

Accepted Answer

Adding 0.004 mol HCl

Question 6

Which of the following best explains why a buffer resists changes in pH?

Accepted Answer

The weak acid neutralizes added base and the conjugate base neutralizes added acid

Question 7

What happens to the pH of a buffer solution when a small amount of strong base is added?

Accepted Answer

The pH increases slightly because the weak acid neutralizes the added base

Question 8

Which of the following is NOT a characteristic of a buffer solution?

Accepted Answer

It contains a strong acid and its conjugate base

Question 9

A buffer is made by mixing 0.01 moles HClO (hypochlorous acid) and 0.05 moles of HCl. Will this mixture act as a buffer?

Accepted Answer

No, because HCl is a strong acid and will destroy the buffer capacity

Question 10

Which of the following combinations will result in a buffer solution?

Accepted Answer

50 mL of 0.10 M HF with 50 mL of 0.10 M NaOH

Question 11

Which of the following is the correct definition of a conjugate base?

Accepted Answer

The species formed when an acid loses a proton ($$H^+)$$

Question 12

A buffer solution is made by mixing 0.01 moles of CH$$_3$$COOH and 0.01 moles of CH$$_3$$COONa. What will happen if 0.001 moles of NaOH are added?

Accepted Answer

The pH will increase slightly, but the buffer will not be destroyed

Question 13

Which of the following is a real-life example of a buffer system in the human body?

Accepted Answer

The bicarbonate ($$HCO_3$$^-$$) and carbonic acid (H_2CO_3$) system in blood

Question 14

Which equation is used to calculate the pH of a buffer solution?

Accepted Answer

$$ \mathrm{pH} = \mathrm{p}K_a + \log \left( \frac{[	ext{A}^-]}{[	ext{HA}]} ight) $$

Question 15

A buffer solution is made by mixing a weak acid and its conjugate base. Which of the following best describes the role of the conjugate base?

Accepted Answer

It neutralizes added strong acid

Question 16

Which of the following statements about buffer capacity is TRUE?

Accepted Answer

Buffer capacity is highest when the concentrations of weak acid and conjugate base are equal

Question 17

Which of the following actions would NOT destroy a buffer made from CH$$_3$$COOH and CH$$_3$$COONa?

Accepted Answer

Adding a small amount of NaOH

Question 18

Which of the following is a correct statement about the effect of dilution on a buffer solution?

Accepted Answer

Dilution decreases the buffer capacity but does not change the pH significantly

Buffer Solutions: Principles, Formation, and Practice Problems

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