Exam 1 v4 with answers

Exam 1 v4 with answers - CHM 2046 EXAM 1 FORM CODE A...

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CHM 2046 EXAM 1 FORM CODE A 1/31/2008 1. Which best describes NH 3 ? (a) A polyprotic base (b) A strong electrolyte (c) A weak base (d) An amphiprotic species (e) The conjugate acid of a weak base 2. Consider a solution of 0.0070 M Ca(OH) 2 ; what is the pH of this solution? (a) 0.602 (b) 12.8 (c) 1.1 (d) 12.1 (e) -2.15 3. Which of the following is not a strong acid? (a) Citric acid (b) HI (c) HBr (d) Nitric acid (e) Perchloric acid 4. A compound, AB, dissociates in water according to the formula AB (aq) A + (aq) + B - (aq) K c = 16 At equilibrium [AB] = 0.25M and [A + ] = [B - ] = 2.0 M. At this point, 2.0 M [B - ] is added to the reaction. What will be the concentration of AB when the system reaches equilibrium again? (a) 0.18 M (b) 0.07 M (c) 0.43 M (d) 0.60 M (e) 0.45 M 5. Without doing any explicit calculations, rank the following solutions in terms of DECREASING pH 0.1 M HI, 0.1 M HF, 0.01M HF, 0.1 M NH 3 , 0.01 M KOH, 0.1 M KOH, 0.1 M NaBr Highest pH Lowest pH (a) 0.1 M HI, 0.01 M HF, 0.1 M HF, 0.1 M NaBr, 0.1 M NH 3 , 0.01 M KOH, 0.1 M KOH (b) 0.1 M HF, 0.01 M HF, 0.1 M HI, 0.1 M NaBr, 0.1 M NH 3 , 0.01 M KOH, 0.1 M KOH (c) 0.01 M KOH, 0.1 M KOH, 0.1 M NH 3 , 0.1 M NaBr, 0.1 M HF, 0.01M HF, 0.1 M HI (d) 0.1 M NH 3 , 0.1 M KOH, 0.01 M KOH, 0.1 M HI, 0.01M HF, 0.1 M HF, 0.1 M NaBr (e) 0.1 M KOH, 0.01 M KOH, 0.1 M NH 3 , 0.1 M NaBr, 0.01 M HF, 0.1M HF, 0.1 M HI 6. Which of the following is NOT a Bronsted base? (a) NH
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This note was uploaded on 04/24/2008 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Exam 1 v4 with answers - CHM 2046 EXAM 1 FORM CODE A...

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