College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 26
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39172) The pH of a solution prepared by dissolving 0.350 mol of solid dimethylamine hydrochloride
172)
((CH 3 ) 2 NH 2 Cl) in 1.00 L of 1.10 M dimethylamine ((CH 3 ) 2 NH) is ________. The K b for
methylamine is 5.40 × 10 -4 . (Assume the final volume is 1.00 L.)
A) 1.66
B) 2.77
C) 11.23
D) 11.14
E) none of the above
173) A 25.0 mL sample of 0.723 M HClO 4 is titrated with a 0.27 M KOH solution. The H 3 O +
173)
concentration after the addition of 80.0 mL of KOH is ________ M.
B) 1 × 10 -7
D) 3 × 10 -13
E) 4 × 10 -2
A) 0.4
C) 0.7
174) The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is
174)
________.
A) 6.29
B) 7.00
C) 8.11
D) 5.78
E) 0.00
175) The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH) 2 and 150.0 mL of 0.125 M
175)
HCl is ________.
A) 6.29
B) 4.11
C) 1.14
D) 5.78
E) 1.34
176) The pH of a solution prepared by mixing 50.0 mL of 0.125 M NaOH and 40.0 mL of 0.125 M HNO 3
176)
is ________.
A) 13.29
B) 7.00
C) 8.11
D) 11.00
E) 12.14
177) A 50.0 mL sample of an aqueous H 2 SO 4 solution is titrated with a 0.375 M NaOH solution. The
177)
equivalence point is reached with 62.5 mL of the base. The concentration of H 2 SO 4 is ________ M.
A) 0.234
B) 0.469
C) 0.150
D) 0.300
E) 0.938
178) The concentration of iodide ions in a saturated solution of lead (II) iodide is ________ M. The
178)
solubility product constant of PbI 2 is 1.4 × 10 -8 .
A) 3.8 × 10 -4
B) 3.0 × 10 -3
C) 1.5 × 10 -3
D) 3.5 × 10 -9
E) 1.4 × 10 -8
179) The concentration of fluoride ions in a saturated solution of barium fluoride is ________ M. The
179)
solubility product constant of BaF 2 is 1.7 × 10 -6 .
A) 3.8 × 10 -4
B) 3.0 × 10 -3
C) 1.5 × 10 -2
D) 7.5 × 10 -3
E) 1.4 × 10 -4
180) The concentration of iodide ions in a saturated solution of silver iodide is ________ M. The
180)
solubility product constant of AgI is 8.3 × 10 -17 .
A) 3.8 × 10 -11
B) 3.0 × 10 -10
C) 9.1 × 10 -9
D) 3.5 × 10 -9
E) 1.4 × 10 -8
26
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