Acids and Bases

Question 1

Under the Bronsted concept of acids and bases, a base is

Answer 1

a proton acceptor

Question 2

Under the Lewis concept of acids and bases, an acid is

Answer 2

an electron pair acceptor

Question 2

Predict the products of the following acid-base reaction: NH3(aq) + HNO3(aq) →

Answer 2

NH4NO3(aq)

Question 2

Predict the products of the following acid-base reaction: HCl(aq) + NaOH(aq) →

Answer 2

NaCl(aq) + H2O(l)

Question 2

Which of the following is NOT an acid-base conjugate pair?

Answer 2

H2S and OH−

Question 2

Under the Bronsted concept of acids and bases, an acid is

Answer 2

a proton donor

Question 3

What effect will addition of excess of HCl have on the pH of a solution of NH3?

Answer 3

decrease the pH

Question 3

A solution that causes only a relatively small change in pH upon the addition of small amounts of acids and bases is

Answer 3

a buffer

Question 4

What effect will addition of sodium acetate have on the pH of a solution of acetic acid?

Answer 4

increase the pH

Question 4

Which of the following is buffer?

Answer 4

NH3/NH4Cl

Question 5

The conjugate base of acetic acid is

Answer 5

CH3COO−

Question 5

A buffer solution may be a mixture of

Answer 5

all of the above (a weak acid and its salt, a weak base and its salt, an excess of a weak acid with a strong base)

Question 6

The conjugate acid of ammonia is

Answer 6

NH4+

Question 7

The effect produced by an ion, say from a salt, which is the same ion produced by the dissociation of a weak acid or base is called

Answer 7

common ion effect

Question 7

Water cannot function as which one of the following?

Answer 7

a Lewis acid

Question 8

A principle which states that if stress is applied to a system at equilibrium, the equilibrium is shifted in the direction that tends to reduce the stress.

Answer 8

Le Chatelier’s Principle

Question 9

Given the following reaction: HCN(aq) + NH3(aq) ⇄ NH4+(aq) + CN−(aq)
The Bronsted acid on the left is

Answer 9

HCN

Question 10

And its conjugate base is

Answer 10

CN−

Question 10

HCOOK is a/an

Answer 10

salt

Question 10

The ammonium ion would be classified as a Bronsted

Answer 10

acid

Question 10

When a strong acid is titrated with a weak base, the pH at the equivalence point is

Answer 10

acidic

Question 11

When a strong acid is titrated with a strong base, the pH at the equivalence point is

Answer 11

neutral

Question 11

When NH4Cl hydrolyzes, the resulting solution is

Answer 11

acidic

Question 12

Which statement is true?

Answer 12

A catalyst speeds up both the forward and reverse reaction rates

Question 13

The lining of the stomach contains cells that secrete a solution of HCl. Which drink would best alleviate
heartburn (excess acid in the stomach)?

Answer 13

milk of magnesia, pH = 10.5

Question 14

Which species are acting as Bronsted acids in the reaction below?
HSO4-(aq) + H2O(l) ⇄ H3O+(aq) + SO4-2(aq)

Answer 14

HSO4- and H3O+

Question 14

Which equation correctly describes the relationship between Kb and Ka for a conjugate acid/base pair?

Answer 14

Kb = Kw / Ka