Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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In
the following reaction
HCO3-(aq) + H2O(l) <=>
CO32-(aq) + H3O+(aq)
a. | HCO3- is an acid and H2O is its conjugate
base. | b. | HCO3- is an acid and
CO32- is its conjugate base. | c. | H3O+ is an acid and HCO3- is its conjugate
base. | d. | H2O is an acid and CO32- is
its conjugate base. | e. | H3O+ is an acid and
CO32- is its conjugate base. | | |
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2.
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The
conjugate acid of HSO4- is ____. a. | OH- | b. | SO42- | c. | H2SO4 | d. | H2O | e. | H3O+ | | |
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3.
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Which
is NOT an amphiprotic species in water? a. | HC2O4- | b. | CH3CO2- | c. | HPO42- | d. | H2PO4- | e. | HCO3- | | |
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4.
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At 15
°C, the water
ionization constant, Kw, is 4.5 x 10-15. What is the
H3O+ concentration in neutral water at this temperature? a. | 2.0 x
10-29 M | b. | 4.5 x 10-15 M | c. | 6.7 x
10-8 M | d. | 1.5 x 10-7 M | e. | 2.2
M | | |
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5.
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A
solution is prepared by diluting 0.16 mol HNO3 with water to a volume of 1.5 L. What is
the pH of this solution? a. | -0.80 | b. | 0.80 | c. | 0.97 | d. | 1.83 | e. | 2.24 | | |
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6.
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At 25
°C, what is the
H3O+ concentration in 0.044 M NaOH(aq)? (Kw = 1.0 x
10-14) a. | 4.4 x
10-16 M | b. | 2.3 x 10-13 M | c. | 4.4 x
10-7 M | d. | 1.36 M | e. | 12.6
M | | |
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7.
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Which
one of the following aqueous solutions will have a pH of 10.00 at 25 °C?
(Kw = 1.0 x 10-14) a. | 1.0 x 101 M HCl | b. | 1.0 x
102 M HNO3 | c. | 1.0 x 10-4 M HBr | d. | 1.0 x
10-4 M NaOH | e. | 1.0 x 102 M KOH | | |
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8.
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What
is the H3O+ concentration of an aqueous solution with a pH of
12.17? a. | 6.8 x
10-13 M | b. | 1.9 x 10-9 M | c. | 5.2 x
10-6 M | d. | 1.5 x 10-2 M | e. | 1.1
M | | |
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9.
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What
is the OH- concentration of an aqueous solution with a pH of 11.45? (Kw
= 1.0 x 10-14) a. | 3.5 x 10-12 M | b. | 9.4 x
10-10 M | c. | 1.1 x 10-5 M | d. | 2.8 x
10-3 M | e. | 7.8 x 10-2 M | | |
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10.
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An
aqueous solution with a pH of 3.00 is diluted from 2.0 L to 4.0 L. What is the pH of the diluted
solution? a. | 1.50 | b. | 1.73 | c. | 3.00 | d. | 3.30 | e. | 6.00 | | |
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11.
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Benzoic acid has a pKa value of 9.14. What is the value of
Kb for sodium benzoate? a. | 7.2 x 10-10 | b. | 1.4 x
10-5 | c. | 1.1 x 10-4 | d. | -4.86 | e. | 4.86 | | |
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12.
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In the
following reaction:
NH4+ (aq) + H2O
(aq) <=> NH3 (aq) + H3O+ (aq)
a. | NH4+ is an acid and H2O is its conjugate base
| b. | H2O is a
base and NH3 is its conjugate acid | c. | NH4+ is an acid and H3O+ is its conjugate
base | d. | H2O is a base and H3O+ is its
conjugate acid | e. | NH4+ is a base and H2O is its
conjugate acid | | |
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13.
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A 0.10 M
solution of an electrolyte has a pH of 4.5. The electrolyte is a. | a strong acid
| b. | a strong
base. | c. | a weak acid. | d. | a weak base.
| e. | none of the
above | | |
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14.
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Acetic acid,
HC2H3O2 is a weak monoprotic acid. What is the
concentration of H+ in 2.0 M acetic acid? a. | 1.0 M
| b. | 2.0 M
| c. | >2.0 M
| d. | <2.0 M
| e. | none of the
above | | |
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15.
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What is
the concentration of H3O+ in a neutral solution?
a. | 0.0 M
| b. | 1.0 x 10-7
M | c. | 1.0 x 10-14 M | d. | >1.0 x
10-14 M | e. | < 1.0 x 10-7 M | | |
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16.
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What is the
concentration of the hydroxide ions in an acidic solution? a. | 0.0 M
| b. | 1.0 x 10-7
M | c. | 1.0 x 10-14 M | d. | >1.0 x
10-7 M | e. | < 1.0 x 10-7 M | | |
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17.
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What is the
concentration of the hydronium ions in an acidic solution? a. | 0.0 M
| b. | 1.0 x 10-7
M | c. | 1.0 x 10-14 M | d. | >1.0 x
10-7 M | e. | < 1.0 x 10-7 M | | |
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18.
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What is the
concentration of the hydroxide ion given that the concentration of the hydronium ion is 1.5 x
10-5 M? a. | 6.7 x 10-10 M | b. | 1.5 x 109
M | c. | 1.0 x 10-14 M | d. | 1.0 x 10-19
M | e. | None of the above | | |
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19.
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What is the
concentration of hydronium ions in a solution given that the concentration of hydroxide ions is 2.31
x 10-4 M? a. | 4.33 x 10-11 M | b. | 2.31 x 1010
M | c. | 2.31 x 10-18 M | d. | 1.01 x 10-5
M | e. | None of the above | | |
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20.
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A buffer
solution is all of the following EXCEPT: a. | a solution that resists a change in pH when a base is added.
| b. | a solution that resists
a change in pH when an acid is added. | c. | a solution that contains both a weak acid and its conjugate base.
| d. | a solution that
regulates pH by the addition of a strong acid or base. | e. | All of the above are
true | | |
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