Chem_126-101_October_13_2010_answers

Chem_126-101_October_13_2010_answers - Exam 2 CHEM 126 Fall...

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Exam 2 CHEM 126 Fall 2010 1 Part A: 16 multiple choice questions worth 4 points each for a total of 64 points 1) Which of the following is a not conjugate acid/base pair? A) HCl/OCl - B) H 2 SO 4 /HSO 4 - C) NH 4 + /NH 3 D) H 2 O/OH - E) C 2 H 3 O 2 - / HC 2 H 3 O 2 2) What is the pH of a 0.50 M KI solution? A) 10.5 B) 7.0 C) 9.2 D) 1.4 E) 4.5 3) What is the correct expression for solubility product of the sparingly soluble salt barium fluoride (BaF 2 ) in water? A) K sp = [Ba 2+ ] [F - ] 2 B) K sp = [Ba 2+ ] [2F - ] 2 C) K sp = [Ba 2+ ] 2 [F - ] D) K sp = [Ba 2+ ] [F - ] E) K sp = [2Ba 2+ ] 2 [F - ] 2 4) A solution contains 0.085M HNO 3 . What is the pH of the solution? A) 12. 93 B ) 1.07 C) 7.00 D) 0.085 E) not enough information 5) Calculate the pOH of a solution that contains 3.9 x 10 -4 M H 3 O + at 25°C. Identify the solution as acidic, basic or neutral. A) pOH= 10.59, basic B) pOH= 10.59, acidic C) pOH= 3.47, basic D) pOH= 3.47, acidic E) pOH= 7.00., neutral
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Exam 2 CHEM 126 Fall 2010 2 6) Which of the following is a polyprotic acid? A) HF B) HCN C) H 2 SO 4 D) CH 4 E) HC 2 H 3 O 2 7) Determine the pH of a 0.461 M HC 7 H 5 O 2 H M solution if the K a of HC 7 H 5 O 2 is 6.5 x 10 -5 A) 2.26 B) 4.52 C) 11.74 D) 9.48 E) 5.48 8) Which of the following indicates the most basic solution? A)
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Chem_126-101_October_13_2010_answers - Exam 2 CHEM 126 Fall...

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