Acids and Bases Flashcards
Under the Bronsted concept of acids and bases, a base is
a proton acceptor
Under the Lewis concept of acids and bases, an acid is
an electron pair acceptor
Predict the products of the following acid-base reaction: NH3(aq) + HNO3(aq) →
NH4NO3(aq)
Predict the products of the following acid-base reaction: HCl(aq) + NaOH(aq) →
NaCl(aq) + H2O(l)
Which of the following is NOT an acid-base conjugate pair?
H2S and OH−
Under the Bronsted concept of acids and bases, an acid is
a proton donor
What effect will addition of excess of HCl have on the pH of a solution of NH3?
decrease the pH
A solution that causes only a relatively small change in pH upon the addition of small amounts of acids and bases is
a buffer
What effect will addition of sodium acetate have on the pH of a solution of acetic acid?
increase the pH
Which of the following is buffer?
NH3/NH4Cl
The conjugate base of acetic acid is
CH3COO−
A buffer solution may be a mixture of
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)
The conjugate acid of ammonia is
NH4+
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
common ion effect
Water cannot function as which one of the following?
a Lewis acid
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.
Le Chatelier’s Principle
Given the following reaction: HCN(aq) + NH3(aq) ⇄ NH4+(aq) + CN−(aq)
The Bronsted acid on the left is
HCN
And its conjugate base is
CN−
HCOOK is a/an
salt
The ammonium ion would be classified as a Bronsted
acid
When a strong acid is titrated with a weak base, the pH at the equivalence point is
acidic
When a strong acid is titrated with a strong base, the pH at the equivalence point is
neutral
When NH4Cl hydrolyzes, the resulting solution is
acidic
Which statement is true?
A catalyst speeds up both the forward and reverse reaction rates
The lining of the stomach contains cells that secrete a solution of HCl. Which drink would best alleviate
heartburn (excess acid in the stomach)?
milk of magnesia, pH = 10.5
Which species are acting as Bronsted acids in the reaction below?
HSO4-(aq) + H2O(l) ⇄ H3O+(aq) + SO4-2(aq)
HSO4- and H3O+
Which equation correctly describes the relationship between Kb and Ka for a conjugate acid/base pair?
Kb = Kw / Ka
