e3_132_f08 - CHE 132 Exam 3, Fall 2008 Multiple Choice, 5...

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CHE 132 Exam 3, Fall 2008 Multiple Choice, 5 points each On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. Which of the following statements is correct? A. pH = 7 at the equivalence point in the titration of a weak base with a strong acid. B. pH < 7 at the midpoint in the titration of a weak base with a strong acid. C. pH > 7 in a 0.2 mol L 1 solution of NH 4 Cl. D. pOH > 7 in a 0.02 mol L 1 solution of NH 4 Cl. E. pOH = 7 in a 0.02 mol L 1 solution of acetic acid. ____ 2. What is the pH of a solution that is 8.88 x 10 9 mol L 1 in NaOH? A. 8.88 x 10 9 B. 8.05 C. 5.95 D. 7.02 E. 6.98 ____ 3. Which of the following represents the most acidic solution? A. [H 3 O + ] = 1.0 M B. [H + ] = 1.0 × 10 14 M C. pH = 3.6 D. [OH ] = 1.0 × 10 14 M E. pOH = 14.7
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4. The K sp expression for silver phosphate, Ag 3 PO 4 is A. [Ag + ][PO ]. B. [Ag + ][PO ] 3 . C. [Ag + ] 3 [PO ]. D. 3[Ag + ][PO ]. E. 3[Ag + ] 3 [PO ]. ____ 5. Calculate the pH of a 0.0140 mol L 1 aqueous solution of sodium benzoate NaC 7 H 5 O 2 . ( K b = 1.6 x 10 10 ) A. 5.82 B. 7.00 C. 8.18 D. 1.85 E. 9.80 ____ 6. What is the concentration of an acetic acid solution if in the titration of 35.0 mL of the solution 22.4 mL of 0.070 mol L 1 KOH solution are needed to reach the equivalence point? A. 0.115 mol L 1 B. 0.070 mol L 1 C. 0.109 mol L 1 D. 0.222 mol L 1 E. 0.045 mol L 1 ____ 7. What is the solubility of PbCl 2 in water at 298 K, expressed in units of mol L 1 , if NaCl is present in the solution with concentration of 0.50 mol L 1 ? K sp = 1.7 x 10 5 . A. 1.7 x 10
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e3_132_f08 - CHE 132 Exam 3, Fall 2008 Multiple Choice, 5...

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