College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 32
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39218) Which is the correct K sp expression for PbCl 2 (s) dissolving in water?
218)
A) K sp = [Pb 2+ ] [Cl – ] 2
B) K sp = [Pb 2+ ] [Cl – ]
C) K sp = [Pb 2+ ] 2 [Cl – ]
D) K sp = [PbCl + ] [Cl – ]
E) K sp = [Pb + ] [Cl 2– ] 2
219) A 25.0-mL sample of 0.150 M hypochlorous acid is titrated with a 0.150 M NaOH solution. What is
219)
the pH after 13.3 mL of base is added? The K a of hypochlorous acid is 3.0 × 10 -8 .
A) 7.25
B) 1.34
C) 4.43
D) 7.58
E) 7.46
220) A 25.0 mL sample of 0.723 M HClO 4 is titrated with a 0.273 M KOH solution. The H 3 O +
220)
concentration after the addition of 0.00 mL of KOH is ________ M.
A) 0.0181
B) 0.430
C) 0.723
D) 0.273
E) none of the above
221) A 25.0 mL sample of an acetic acid solution is titrated with a 0.175 M NaOH solution. The
221)
equivalence point is reached when 10.2 mL of the base is added. The concentration of acetic acid in
the sample was ________ M.
A) 0.365
B) 0.175
C) 0.119
D) 0.0714
E) none of the above
222) A 25.0 mL sample of an HCl solution is titrated with a 0.139 M NaOH solution. The equivalence
222)
point is reached with 15.4 mL of base. The concentration of HCl is ________ M.
A) 11.7
B) 0.00214
C) 0.0856
D) 0.267
E) 0.139
223) The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 35.0 mL of 0.145 M HCl is
223)
________.
A) 1.314
B) 1.403
C) 0.00824
D) 12.597
E) 12.923
224) The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M
224)
HC 2 H 3 O 2 is ________.
A) 9.97
B) 7.74
C) 0.878
D) 13.122
E) none of the above
225) What is the molar solubility of calcium carbonate ( CaCO 3 ) in water? The solubility-product
225)
constant for CaCO 3 is 4.5 × 10 -9 at 25 °C.
A) 2.3 × 10 -9
B) 9.0 × 10 -9
D) 9.5 × 10 -5
E) 6.7 × 10 -5
C) 8.35
32
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