Question 1

Which of the following would you expect to be a Brønsted-Lowry acid?

Accepted Answer

H2SO4

Question 2

Which of the following would you expect to be a Brønsted-Lowry base?

Accepted Answer

NH3

Question 3

The zwitterion form of the amino acid alanine can act as:

Accepted Answer

Both an acid and a base

Question 4

In the reaction below, which of the following are conjugate acid-base pairs?

$\mathrm{HS^- + HF \rightarrow H_2S + F^-}$

Accepted Answer

HS$^-$ / H$_2$S and HF / F$^-$

Question 5

Given the base dissociation constant $K_b$ for acetate ion is $5.6 	imes 10^{-10}$, which is the strongest acid among the following?

Accepted Answer

Acetic acid

Question 6

A 0.10 M solution of ammonium ion, NH$_4^+$, has a pH of 5.6. Ammonium ion is a:

Accepted Answer

Weak acid

Question 7

Given the following acids and their $pK_a$ values, which is the strongest acid?

Acetic acid, $pK_a = 4.8$
Formic acid, $pK_a = 3.8$
Propanoic acid, $pK_a = 4.9$

Accepted Answer

Formic acid

Question 8

In a titration, if the blue spheres represent H$^+$ ions and the large spheres represent OH$^-$ ions, and there are twice as many blue spheres as large spheres, what is the concentration of the acid if the base is 0.24 M?

Accepted Answer

0.48 M

Question 9

Which of the following will NOT result in a buffer solution?

Accepted Answer

50 mL 1.0 M CH$_3$COONa + 25 mL 1.0 M NaOH

Question 10

Which acid would be most appropriate to prepare a pH 5.0 buffer solution?

Acetic acid, $pK_a = 4.8$
Formic acid, $pK_a = 3.8$
Propanoic acid, $pK_a = 4.9$

Accepted Answer

Acetic acid

Question 11

Which is an acidic salt?

Accepted Answer

NH$_4$Cl

Question 12

Which is a basic salt?

Accepted Answer

KCN

Question 13

A solution is prepared by mixing 0.10 mol of acetic acid and 0.10 mol of sodium acetate in 1.0 L of water. What is the pH of the solution? ($pK_a$ of acetic acid = 4.8)

Accepted Answer

4.8

Question 14

Which of the following best describes the role of a buffer in blood plasma?

Accepted Answer

It maintains a constant pH by neutralizing added acids or bases.

Question 15

If the $K_a$ of an acid is $1.8 	imes 10^{-5}$, what is its $pK_a$?

Accepted Answer

$4.74$

Question 16

A patient is experiencing metabolic acidosis. Which of the following could be a physiological response to compensate?

Accepted Answer

Increased breathing rate to expel CO$_2$

Question 17

Which of the following is a correct statement about the relationship between $K_a$ and acid strength?

Accepted Answer

A larger $K_a$ value indicates a stronger acid.

Question 18

Which of the following combinations would create a buffer solution?

Accepted Answer

HCOOH and HCOONa

Question 19

A solution has a pH of 2. What is the concentration of H$^+$ ions in the solution?

Accepted Answer

$1 	imes 10^{-2}$ M

Question 20

Which of the following is the conjugate base of HCOOH?

Accepted Answer

HCOO$^-$

Acids and Bases: Bronsted-Lowry Theory, pH, and Buffer Solutions (Chapter 10 Study Notes)

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