College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 21
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39138) What change will be caused by addition of a small amount of HCl to a solution containing fluoride
138)
ions and hydrogen fluoride?
A) The concentration of hydronium ions will increase significantly.
B) The concentration of fluoride ions will increase as will the concentration of hydronium ions.
C) The concentration of hydrogen fluoride will decrease and the concentration of fluoride ions
will increase.
D) The concentration of fluoride ion will decrease and the concentration of hydrogen fluoride
will increase.
E) The fluoride ions will precipitate out of solution as its acid salt.
139) The Henderson-Hasselbalch equation is ________.
139)
[base]
A) [H + ] = K a +
[acid]
[base]
B) pH = pK a - log
[acid]
[base]
C) pH = pK a + log
[acid]
[acid]
D) pH = pK a + log
[base]
[acid]
E) pH = log
[base]
140) In a solution, when the concentrations of a weak acid and its conjugate base are equal, ________.
140)
A) the system is not at equilibrium
B) the buffering capacity is significantly decreased
C) the -log of the [H + ] and the -log of the K a are equal
D) All of the above are true.
141) Of the following solutions, which has the greatest buffering capacity?
141)
A) 0.521 M HC 2 H 3 O 2 and 0.217 M NaC 2 H 3 O 2
B) 0.821 M HC 2 H 3 O 2 and 0.713 M NaC 2 H 3 O 2
C) 0.365M HC 2 H 3 O 2 and 0.497 M NaC 2 H 3 O 2
D) 0.121 M HC 2 H 3 O 2 and 0.116 M NaC 2 H 3 O 2
142) Of the following solutions, which has the greatest buffering capacity?
142)
A) 0.543 M NH 3 and 0.555 M NH 4 Cl
B) 0.087 M NH 3 and 0.088 M NH 4 Cl
C) 0.234 M NH 3 and 0.100 M NH 4 Cl
D) 0.100 M NH 3 and 0.455 M NH 4 Cl
E) They are all buffer solutions and would all have the same capacity.
143) The addition of hydrofluoric acid and ________ to water produces a buffer solution.
143)
A) HCl
B) NaNO 3
C) NaCl
D) NaOH
E) NaBr
144) The addition of hydrochloric acid and ________ to water produces a buffer solution.
144)
A) HC 6 H 5 O
B) NaOH
C) NH 3
D) HNO 3
E) NaNO 3
21
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