ch16_testbank.doc
TRANSCRIPT
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
16.1 Multiple-Choice and Bimodal Questions.
1) What is the conjugate acid of ?
A)
B)
C)
D)
E)
Answer: D Diff: 2 Page Ref: Sec. 16.2
2) The conjugate base of is __________.
A)
B)
C) D)
E)
Answer: C Diff: 2 Page Ref: Sec. 16.2
3) The conjugate acid of is __________.
A)
B)
C) D) E)
Answer: B Diff: 2 Page Ref: Sec. 16.2
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
4) What is the conjugate base of ?
A)
B)
C)
D)
E)
Answer: D Diff: 2 Page Ref: Sec. 16.2
5) What is the pH of an aqueous solution at 25.0 °C in which is 0.0025 M?
A) 3.40 B) 2.60 C) -2.60 D) -3.40 E) 2.25
Answer: B Diff: 2 Page Ref: Sec. 16.4
6) What is the pH of an aqueous solution at 25.0 °C in which is 0.0025 M?
A) +2.60 B) -2.60 C) +11.4 D) -11.4 E) -2.25
Answer: C Diff: 2 Page Ref: Sec. 16.4
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
7) What is the pH of an aqueous solution at 25.0 °C that contains hydronium ion?
A) 8.400 B) 5.600 C) 9.000 D) 3.980 E) 7.000
Answer: A Diff: 2 Page Ref: Sec. 16.4
8) What is the pH of an aqueous solution at 25.0 °C that contains hydroxide ion?
A) 8.40 B) 5.60 C) 9.00 D) 3.98 E) 7.00
Answer: B Diff: 2 Page Ref: Sec. 16.4
9) What is the concentration (in M) of hydronium ions in a solution at 25.0 °C with pH = 4.282?
A) 4.28 B) 9.71 C) D) E)
Answer: D Diff: 2 Page Ref: Sec. 16.4
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
10) What is the concentration (in M) of hydroxide ions in a solution at 25.0 °C with pH = 4.282?
A) 4.28 B) 9.72 C) D) E)
Answer: C Diff: 2 Page Ref: Sec. 16.4
11) Calculate the pOH of a solution at 25.0 °C that contains hydronium ions.
A) 1.94 B) 4.29 C) 7.00 D) 14.0 E) 9.71
Answer: B Diff: 2 Page Ref: Sec. 16.4
12) Calculate the concentration (in M) of hydronium ions in a solution at 25.0 °C with a pOH of 4.223.
A) B) C) D) E)
Answer: B Diff: 2 Page Ref: Sec. 16.4
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
13) What is the pH of a 0.015 M aqueous solution of barium hydroxide?
A) 12.48 B) 12.25 C) 1.82 D) 10.41 E) 1.52
Answer: A Diff: 3 Page Ref: Sec. 16.5
14) What is the pOH of a 0.0150 M solution of barium hydroxide?
A) 12.2 B) 12.5 C) 1.52 D) 1.82 E) 10.4
Answer: C Diff: 2 Page Ref: Sec. 16.5
15) An aqueous solution contains 0.100 M NaOH at 25.0 °C. The pH of the solution is __________.
A) 0.100 B) 1.00 C) 13.00 D) 7.00 E) -1.00
Answer: C Diff: 3 Page Ref: Sec. 16.5
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
16) HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution. The pH of the solution was 4.93 at
25.0 °C. The of HZ is __________.
A) B) C) D) E)
Answer: B Diff: 4 Page Ref: Sec. 16.6
17) The pH of a 0.55 M aqueous solution of hypobromous acid, HBrO, at 25.0 °C is 4.48.
What is the value of for HBrO?
A) B) C) D) E)
Answer: A Diff: 4 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
18) A 0.15 M aqueous solution of the weak acid HA at 25.0 °C has a pH of 5.35. The
value of for HA is __________.
A) B) C) D) E)
Answer: D Diff: 4 Page Ref: Sec. 16.6
19) The of hypochlorous acid (HClO) is at 25.0 °C. Calculate the pH of a
hypochlorous acid solution.
A) 1.41 B) 8.94 C) 4.47 D) 7.52 E) -1.41
Answer: C Diff: 4 Page Ref: Sec. 16.6
20) The of hypochlorous acid (HClO) is What is the pH at 25.0 °C of an
aqueous solution that is in
A) +2.45 B) -2.45 C) -9.22 D) +9.22 E) +4.61
Answer: E Diff: 4 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
21) The of hydrofluoric acid (HF) at 25.0 °C is . What is the pH of a
0.35 M aqueous solution of HF?
A) 3.25 B) 1.81 C) 3.64 D) 0.46 E) 1.22
Answer: B Diff: 3 Page Ref: Sec. 16.6
22) The of hydrazoic acid is at 25.0 °C. What is the pH of a 0.35 M
aqueous solution of
A) 1.14 B) 2.41 C) 5.23 D) 2.59 E) -2.46
Answer: D Diff: 4 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
23) The acid-dissociation constants of sulfurous acid are and
at 25.0 °C. Calculate the pH of a 0.163 M aqueous solution of sulfurous
acid.
A) 4.53 B) 1.30 C) 1.86 D) 6.21 E) 1.93
Answer: B Diff: 5 Page Ref: Sec. 16.6
24) The acid-dissociation constants of phosphoric acid are ,
and at 25.0 °C. What is the pH of a 2.5 M aqueous
solution of phosphoric acid?
A) 1.82 B) 0.40 C) 2.51 D) 0.88 E) 0.13
Answer: D Diff: 5 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
25) The pH of a 0.10 M solution of a weak base is 9.82. What is the for this base?
A) B) C) D) E)
Answer: B Diff: 4 Page Ref: Sec. 16.7
26) Calculate the pH of a 0.500 M aqueous solution of . The of is
.
A) 8.95 B) 11.47 C) 2.52 D) 5.05 E) 3.01
Answer: B Diff: 3 Page Ref: Sec. 16.7
27) Determine the pH of a 0.35 M aqueous solution of (methylamine). The
of methylamine is .
A) 10.00 B) 3.86 C) 12.09 D) 1.96 E) 13.24
Answer: C Diff: 3 Page Ref: Sec. 16.7
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
28) An aqueous solution contains 0.050 M of methylamine. The concentration of
hydroxide ion in this solution is __________ M. for methylamine is .
A) 0.050 B) C) D) E)
Answer: D Diff: 5 Page Ref: Sec. 16.7
29) The acid-dissociation constant, , for gallic acid is What is the base-
dissociation constant, , for the gallate ion?
A) B) C) D) E)
Answer: B Diff: 3 Page Ref: Sec. 16.8
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
30) The base-dissociation constant, , for pyridine, , is The
acid-dissociation constant, , for the pyridinium ion, is __________.
A) B) C) D) E)
Answer: E Diff: 3 Page Ref: Sec. 16.8
31) The for HCN is . What is the value of for ?
A) B) C) D) E)
Answer: A Diff: 3 Page Ref: Sec. 16.8
32) for HF is . for the fluoride ion is __________.
A) B) C) D) E)
Answer: B Diff: 3 Page Ref: Sec. 16.8
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
33) Calculate the pOH of a 0.0827 M aqueous sodium cyanide solution at 25.0 °C.
for is
A) 9.33 B) 10.00 C) 5.20 D) 1.17 E) 8.89
Answer: C Diff: 3 Page Ref: Sec. 16.9
34) Determine the pH of a 0.15 M aqueous solution of KF. For hydrofluoric acid,
A) 12.01 B) 5.85 C) 8.17 D) 2.32 E) 6.68
Answer: C Diff: 3 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
35) Calculate the pH of 0.726 M anilinium hydrochloride solution in
water, given that for aniline is .
A) 1.77 B) 12.2 C) 5.36 D) 8.64 E) 12.4
Answer: C Diff: 4 Page Ref: Sec. 16.9
36) for is What is the pH of a 0.35 M aqueous solution of at
25.0 °C?
A) 9.76 B) 4.35 C) 9.11 D) 4.86 E) 11.23
Answer: D Diff: 4 Page Ref: Sec. 16.9
37) The for formic acid is What is the pH of a 0.35 M aqueous
solution of sodium formate ?
A) 11.64 B) 5.42 C) 3.39 D) 8.64 E) 4.26
Answer: D Diff: 4 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
38) for HCN is What is the pH of a 0.068 M aqueous solution of sodium
cyanide?
A) 0.74 B) 2.96 C) 11.07 D) 13.24 E) 7.00
Answer: C Diff: 4 Page Ref: Sec. 16.9
39) for HX is . What is the pH of a 0.15 M aqueous solution of NaX?
A) 7.97 B) 1.96 C) 6.00 D) 8.04 E) 12.10
Answer: E Diff: 5 Page Ref: Sec. 16.9
40) The pH of a 0.15 M aqueous solution of NaZ (the sodium salt of HZ) is 10.7. What is
the for HZ?
A) B) C) D) E)
Answer: B Diff: 4 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
16.2 Multiple-Choice Questions
1) According to the Arrhenius concept, an acid is a substance that __________.
A) is capable of donating one or more B) causes an increase in the concentration of in aqueous solutions C) can accept a pair of electrons to form a coordinate covalent bond D) reacts with the solvent to form the cation formed by autoionization of that solvent E) tastes bitter
Answer: B Diff: 1 Page Ref: Sec. 16.1
2) A Br nsted-Lowry base is defined as a substance that __________.
A) increases when placed in
B) decreases when placed in
C) increases when placed in D) acts as a proton acceptor E) acts as a proton donor
Answer: D Diff: 1 Page Ref: Sec. 16.2
3) A Br nsted-Lowry acid is defined as a substance that __________.
A) increases when placed in
B) decreases when placed in
C) increases when placed in D) acts as a proton acceptor E) acts as a proton donor
Answer: E Diff: 1 Page Ref: Sec. 16.2
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
4) A substance that is capable of acting as both an acid and as a base is __________.
A) autosomal B) conjugated C) amphoteric D) saturated E) miscible
Answer: C Diff: 1 Page Ref: Sec. 16.2
5) The molar concentration of hydronium ion in pure water at 25 °C is __________.
A) 0.00 B) C) D) 1.00 E) 7.00
Answer: B Diff: 1 Page Ref: Sec. 16.3
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
6) The molar concentration of hydroxide ion in pure water at 25 °C is __________.
A) 1.00 B) 0.00 C) D) E) 7.00
Answer: D Diff: 1 Page Ref: Sec. 16.3
7) The magnitude of indicates that __________.
A) water autoionizes very slowly B) water autoionizes very quickly C) water autoionizes only to a very small extent D) the autoionization of water is exothermic
Answer: C Diff: 2 Page Ref: Sec. 16.3
8) In basic solution, __________.
A)
B)
C)
D)
E)
Answer: C Diff: 2 Page Ref: Sec. 16.3
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
9) Which solution below has the highest concentration of hydroxide ions?
A) pH = 3.21 B) pH = 12.6 C) pH = 7.93 D) pH = 9.82 E) pH = 7.00
Answer: B Diff: 1 Page Ref: Sec. 16.4
10) Which one of the following statements regarding is false?
A) is 14.00 at 25 °C
B) The value of is always 1.0 × 10-14.
C) changes with temperature.
D) The value of shows that water is a weak acid.
E) is known as the ion product of water.
Answer: B Diff: 2 Page Ref: Sec. 16.4
11) The hydride ion, , is a stronger base than the hydroxide ion, . The product(s) of the reaction of hydride ion with water is/ are __________.
A)
B)
C) D) no reaction occurs E)
Answer: B Diff: 3 Page Ref: Sec. 16.5
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
12) An aqueous solution contains 0.10 M NaOH. The solution is __________.
A) very dilute B) highly colored C) basic D) neutral E) acidic
Answer: C Diff: 1 Page Ref: Sec. 16.5
13) Nitric acid is a strong acid. This means that __________.
A) aqueous solutions of contain equal concentrations of and
B) does not dissociate at all when it is dissolved in water
C) dissociates completely to and when it dissolves in water
D) produces a gaseous product when it is neutralized
E) cannot be neutralized by a weak base
Answer: C Diff: 2 Page Ref: Sec. 16.5
14) Of the following acids, __________ is not a strong acid.
A)
B)
C)
D) E) HCl
Answer: A Diff: 2 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
15) Of the following, __________ is a weak acid.
A) HF B) HCl C) HBr D)
E)
Answer: A Diff: 2 Page Ref: Sec. 16.6
16) Which one of the following is the weakest acid?
A)
B)
C)
D)
E) Acetic acid
Answer: D Diff: 2 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
17) Of the acids in the table below, __________ is the strongest acid.
A) HOAc B) C) HClO D) HF E) HOAc and
Answer: D Diff: 3 Page Ref: Sec. 16.6
18) The of hypochlorous acid (HClO) is at . What is the %
ionization of hypochlorous acid in a aqueous solution of HClO at
A) B) 14 C) D) 0.14 E)
Answer: D Diff: 4 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
19) Which one of the following is a Br nsted-Lowry acid?
A)
B) C) HF D) E) all of the above
Answer: E Diff: 2 Page Ref: Sec. 16.6
20) In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization?
A)
B)
C)
D)
E) These will all exhibit the same percentage ionization.
Answer: C Diff: 4 Page Ref: Sec. 16.6
21) Classify the following compounds as weak acids (W) or strong acids (S):
benzoic acid nitric acid acetic acid A) W W W B) S S S C) S W W D) W S S E) W S W
Answer: E Diff: 3 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
22) Classify the following compounds as weak acids (W) or strong acids (S):
hydrocyanic acid hydrofluroic acid phenol A) W W W B) S S S C) S W W D) W S S E) W S W
Answer: A Diff: 3 Page Ref: Sec. 16.6
23) Classify the following compounds as weak acids (W) or strong acids (S):
nitrous acid hydrochloric acid hydrofluoric acid A) W W W B) S S S C) S W W D) W S S E) W S W
Answer: E Diff: 3 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
24) Classify the following compounds as weak acids (W) or strong acids (S):
hypochlorous acid perchloric acid chloric acid A) W S S B) S S S C) S W W D) W W W E) W S W
Answer: A Diff: 3 Page Ref: Sec. 16.6
25) Ammonia is a __________.
A) weak acid B) strong base C) weak base D) strong acid E) salt
Answer: C Diff: 2 Page Ref: Sec. 16.7
26) HA is a weak acid. Which equilibrium corresponds to the equilibrium constant
for ?
A)
B)
C)
D)
E)
Answer: D Diff: 3 Page Ref: Sec. 16.7
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
27) A- is a weak base. Which equilibrium corresponds to the equilibrium constant
for HA?
A)
B)
C)
D)
E)
Answer: C Diff: 3 Page Ref: Sec. 16.7
28) Classify the following compounds as weak bases (W) or strong bases (S):
ammonia flouride ion sodium hydroxide A) W W S B) S S S C) S W W D) W S S E) W S W
Answer: A Diff: 2 Page Ref: Sec. 16.7
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
29) Classify the following compounds as weak bases (W) or strong bases (S):
methylamine carbonate ion potassium hydroxide A) W W S B) S S S C) S W W D) W S S E) W S W
Answer: A Diff: 2 Page Ref: Sec. 16.7
30) Using the data in the table, which of the conjugate bases below is the strongest base?
A)
B)
C)
D)
E) and
Answer: A Diff: 3 Page Ref: Sec. 16.8
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
31) Using the data in the table, which of the conjugate bases below is the weakest base?
A)
B)
C)
D)
E) and
Answer: D Diff: 3 Page Ref: Sec. 16.8
32) Using the data in the table, which of the conjugate bases below is the strongest base?
A)
B)
C) D)
E) and
Answer: C Diff: 3 Page Ref: Sec. 16.8
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
33) Using the data in the table, which of the conjugate bases below is the weakest base?
A)
B)
C) D)
E) and
Answer: D Diff: 3 Page Ref: Sec. 16.8
34) Using the data in the table, which of the conjugate acids below is the strongest acid?
A) HClO B)
C)
D)
E) and HClO
Answer: C Diff: 3 Page Ref: Sec. 16.8
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
35) Using the data in the table, which of the conjugate acids below is the weakest acid?
A) HClO B)
C)
D)
E) and HClO
Answer: D Diff: 3 Page Ref: Sec. 16.8
36) Using the data in the table, which of the conjugate acids below is the strongest acid?
A)
B)
C)
D)
E) and
Answer: B Diff: 3 Page Ref: Sec. 16.8
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
37) Using the data in the table, which of the conjugate acids below is the weakest acid?
A)
B)
C)
D) E) and
Answer: D Diff: 3 Page Ref: Sec. 16.8
38) Which of the following ions will act as a weak base in water?
A) B) C) D) E) None of the above will act as a weak base in water.
Answer: D Diff: 3 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
39) Which of the following ions will act as a weak base in water?
A) B)
C)
D) E) All of the above will act as a weak base in water.
Answer: E Diff: 3 Page Ref: Sec. 16.9
40) Which of the following aqueous solutions has the highest ?
A) a solution with a pH of 3.0 B) a solution of C) a solution with a pOH of 12.0 D) pure water E) a solution of
Answer: D Diff: 3 Page Ref: Sec. 16.9
41) Which of the following aqueous solutions has the lowest ?
A) a solution with a pH of 3.0 B) a M solution of C) a solution with a pOH of 12.0 D) pure water E) a solution of
Answer: C Diff: 3 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
42) A 0.0035 M aqueous solution of a particular compound has pH = 2.46. The compound is __________.
A) a weak base B) a weak acid C) a strong acid D) a strong base E) a salt
Answer: C Diff: 3 Page Ref: Sec. 16.9
43) Of the following substances, an aqueous solution of __________ will form basic solutions.
A) ,
B) C) NaF only D) NaF, E) NaHS, KHCO3 and NaF
Answer: E Diff: 3 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
44) Of the following substances, an aqueous solution of __________ will form basic solutions.
A) ,
B) , C) NaF only D) ,
E) only
Answer: D Diff: 3 Page Ref: Sec. 16.9
45) A 0.1 M aqueous solution of __________ will have a pH of 7.0 at 25.0 °C.
A) NaOCl B) KCl C)
D)
E) and
Answer: B Diff: 3 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
46) Of the compounds below, a 0.1 M aqueous solution of __________ will have the highest pH.
A) , of
B) , of
C) , of
D) , of
E) , of
Answer: A Diff: 5 Page Ref: Sec. 16.9
47) A 0.1 M solution of __________ has a pH of 7.0.
A) B) KF C)
D) E) NaF
Answer: C Diff: 4 Page Ref: Sec. 16.9
48) An aqueous solution of __________ will produce a basic solution.
A)B) KBr C) NaCl D)
E)
Answer: E Diff: 3 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
49) Of the following, which is the strongest acid?
A) HIO B)
C)
D) E) The acid strength of all of the above is the same.
Answer: B Diff: 3 Page Ref: Sec. 16.10
50) Of the following, which is the weakest acid?
A) HIO B)
C)
D) E) The acid strength of all of the above is the same.
Answer: A Diff: 3 Page Ref: Sec. 16.10
51) Which of the following acids will be the strongest?
A)
B)
C)
D)
E)
Answer: A Diff: 3 Page Ref: Sec. 16.10
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
52) Of the following, which is the strongest acid?
A) HClO B)
C)
D) E) HIO
Answer: D Diff: 3 Page Ref: Sec. 16.10
53) In the gas phase reaction below, is acting as a(n) __________ base but not as a(n) __________ base.
A) Arrhenius, Br nsted-Lowry B) Br nsted-Lowry, Lewis C) Lewis, Arrhenius D) Lewis, Br nsted-Lowry E) Arrhenius, Lewis
Answer: C Diff: 3 Page Ref: Sec. 16.11
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
16.3 Short Answer Questions.
1) A solution of acetic acid is 2.0% dissociated at 25.0 °C. What was the original
concentration (in M) of the acetic acid solution? The at 25.0 °C for acetic acid is
.
Answer: 0.045 Diff: 5 Page Ref: Sec. 16.6
2) A solution of formic acid is 3.0% dissociated at 25.0 °C. What is the original
concentration (in M) of the formic acid solution? The at 25.0 °C for formic acid is
.
Answer: 0.20 Diff: 5 Page Ref: Sec. 16.6
3) A solution of ammonia is 2.0% ionized at 25.0 °C. What was the original
concentration (in M) of the ammonia solution? The at 25.0 °C for ammonia is
.
Answer: 0.045 Diff: 5 Page Ref: Sec. 16.7
4) What is the pH of a sodium acetate solution prepared by adding 0.820 grams of
sodium acetate to 100.0 ml of water at 25.0 °C? The at 25.0 °C for acetic acid is
.
Answer: 8.87 Diff: 5 Page Ref: Sec. 16.9
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
5) What is the pH of a sodium formate solution prepared by adding 0.680 grams of
sodium formate to 100.0 ml of water at 25.0 °C? The at 25.0 °C for formic acid is
.
Answer: 8.46 Diff: 5 Page Ref: Sec. 16.9
16.4 True/False Questions.
1) An acid containing the COOH group is called a carbo-oxy acid. Answer: False
Diff: 2 Page Ref: Sec. 16.10
2) In the reaction
acts as a Br nsted-Lowry acid. Answer: False
Diff: 3 Page Ref: Sec. 16.11
3) The simplest amino acid is glycine. Answer: True
Diff: 1 Page Ref: Sec. 16.11
4) When the proton in the COOH group in an amino acid is transferred to the group of that same amino acid molecule, a zwitterion is formed. Answer: True
Diff: 2 Page Ref: Sec. 16.11
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
5) A Lewis acid is an electron-pair acceptor, and a Lewis base is an electron-pair donor. Answer: True
Diff: 2 Page Ref: Sec. 16.11
16.5 Algorithmic Questions
1) An aqueous solution at 25.0 °C contains . What is the pH of the solution?
A) 1.00 B) -1.00 C) 13.0 D) 0.0990 E)
Answer: A Diff: 3 Page Ref: Sec. 16.4
2) The pH of an aqueous solution at 25.0 °C is 10.66. What is the molarity of in this solution?
A) B) C) 3.3 D) E)
Answer: A Diff: 3 Page Ref: Sec. 16.4
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
3) Calculate the molarity of hydroxide ion in an aqueous solution that has a pOH of 5.33.
A) B) 8.67 C) D) E)
Answer: A Diff: 3 Page Ref: Sec. 16.4
4) A M aqueous solution of at 25.0 °C has a pH of __________.
A) 12.15 B) 1.85 C) D) E) 11.85
Answer: A Diff: 3 Page Ref: Sec. 16.5
5) The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO) is .
At equilibrium, the molarity of in a 0.010 M solution of HClO is __________.
A) B) 0.010 C) D) 4.76 E) 2.00
Answer: A Diff: 4 Page Ref: Sec. 16.6
Chemistry, 11e (Brown/LeMay/Bursten/Murphy)Chapter 16 Acid-Base Equilibria
6) The base-dissociation constant of ethylamine is at 25.0 °C. The
in a solution of ethylamine is __________ M.
A) B) C) D) E) 11.46
Answer: A Diff: 5 Page Ref: Sec. 16.7
7) The acid-dissociation constant of hydrocyanic acid (HCN) at 25.0 °C is . What is the pH of an aqueous solution of 0.080 M sodium cyanide (NaCN)?
A) 11.11 B) 2.89 C) D) E)
Answer: A Diff: 4 Page Ref: Sec. 16.9