e3_132_f09 - Exam 3, CHE 132 Fall 2009 Multiple Choice, 5...

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Exam 3, CHE 132 Fall 2009 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 mixtures has the higher pH? A. Equal volumes of 0.1 mol/L HCl and 0.1 mol/L NaOH B. Equal volumes of 0.1 mol/L HCl and 0.1 mol/L HF C. Equal volumes of 0.1 mol/L HF and 0.1 mol/L NaCl D. Equal volumes of 0.1 mol/L HF and 0.1 mol/L NaOH E. Equal volumes of 0.1 mol/L KCl and 0.1 mol/L NH 4 Cl ____ 2. What is the pH of a buffer solution prepared mixing 10.0 mL of aqueous acetic acid of concentration 0.20 mol L –1 with 20.0 mL of a 0.1 mol L 1 aqueous sodium acetate solution? The ionization constant of acetic acid is K a = 1.8 x 10 5 . A. 4.22 B. 4.63 C. 5.04 D. 4.44 E. 4.74 ____ 3. What is the pH of the resulting solution if 0.020 mol of HCl gas are bubbled into 500.0 mL of a solution that is 0.50 mol L 1 in NH 3 and 0.500 mol L 1 in NH 4 Cl? Assume that the volume of the solution does not change by the bubbling of HCl. For ammonia K b = 1.81 x 10 5 . A. 9.19 B. 7.38 C. 4.81 D. 9.26 E. 4.74
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4. A 60.0 mL sample of a weak monoprotic acid is titrated with 0.150 mol/L NaOH. If 18.0 mL of base is required to reach the equivalence point, what is the concentration of the acid? A. 0.500 mol L 1 B. 0.300 mol L 1 C. 0.045 mol L 1 D. 0.0025 mol L 1 E. 0.150 mol L 1 ____ 5. What is the stoichiometric coefficient for Al 3+ in the balanced equation for the reaction in acid solution when the stoichiometric coefficient of Mn 2+ is 3? MnO 4 (aq) + Al(s) Mn 2+ (aq) + Al 3+ (aq) A. 1 B. 2 C. 3 D. 4 E. 5 ____ 6. Calculate the pH of a 0.100 mol L 1 aqueous solution of ammonium chloride NH 4 Cl. K
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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e3_132_f09 - Exam 3, CHE 132 Fall 2009 Multiple Choice, 5...

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