College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key (Page 30 of 39) in pdf

College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 30

201) The pH of a solution that contains 0.800 M acetic acid (K a = 1.76 × 10 -5 ) and 0.172 M sodium

201)

acetate is ________.

A) 4.087

B) 5.422

C) 8.578

D) 8.370

E) 9.913

202) Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen fluoride. The

202)

concentration of fluoride ions after the addition of 9.00 mL of 0.0100 M HCl to 25.0 mL of this

solution is ________ M.

A) 0.0735

B) 0.0762

C) 0.0980

D) 0.0709

E) 0.00253

203) Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen fluoride. The

203)

concentration of hydrogen fluoride after addition of 9.00 mL of 0.0100 M HCl to 25.0 mL of this

solution is ________ M.

A) 0.0953

B) 0.0900

C) 0.130

D) 0.122

E) 0.00976

204) The K a of acetic acid is 1.76 × 10 -5 . The pH of a buffer prepared by combining 15.0 mL of 1.00 M

204)

potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

A) 1.705

B) 0.851

C) 3.406

D) 4.232

E) 2.383

205) The K b of ammonia is 1.76 × 10 -5 . The pH of a buffer prepared by combining 50.0 mL of 1.00 M

205)

ammonia and 45.0 mL of 1.00 M ammonium nitrate is ________.

A) 4.632

B) 9.291

C) 4.742

D) 9.372

E) none of the above

206) Calculate the pH of a solution prepared by dissolving 0.270 mol of formic acid (HCO 2 H) and 0.260

206)

mol of sodium formate (NaCO 2 H) in water sufficient to yield 1.00 L of solution. The K a of formic

acid is 1.77 × 10 -4 .

A) 2.099

B) 10.264

C) 3.736

D) 2.307

E) 3.952

207) Calculate the pH of a solution prepared by dissolving 0.850 mol of NH 3 and 0.300 mol of NH 4 Cl in

207)

water sufficient to yield 1.00 L of solution. The K b of ammonia is 1.77 × 10 -5 .

A) 5.204

B) 4.300

C) 9.700

D) 8.781

E) 8.796

208) Calculate the pH of a solution prepared by dissolving 0.250 mol of benzoic acid (C 7 H 5 O 2 H) and

208)

0.150 mol of sodium benzoate (NaC 7 H 5 O 2 ) in water sufficient to yield 1.00 L of solution. The K a of

benzoic acid is 6.50 × 10 -5 .

A) 4.409

B) 3.965

C) 10.035

D) 9.591

E) 5.190

College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 30

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