2005 Exam03 - CHE 132 Spring 2005 Midterm Exam 3 Multiple...

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Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Which of the following is a conjugate acid-base pair? a. CH 3 COO - and H 2 O b. H 3 O + and OH - c. CH 3 COOH and CH 3 COO - d. CH 3 COOH and H 3 O + e. CH 3 COOH and OH - ____ 2. Methylamine, CH 3 NH 2 , which is a weak base, reacts with water to produce_________. a. OH - and CH 3 NH 3 + b. H 3 O + and CH 3 NH 3 + c. H 3 O + and OH - d. OH - and CH 3 NH - e. H 3 O + and CH 3 NH - ____ 3. Which ending to this sentence is not correct: Some weak acids are stronger than others because a. the proton is attached to a more electropositive atom, like CH 4 vs H 2 O. b. the weaker acid has a negative charge, like H 2 PO 4 - vs H 3 PO 4 . c. the conjugate base is stabilized by resonance, like HClO 2 vs HClO. d. more electronegative groups stabilize the conjugate base, like CCl 3 COOH vs CH 3 COOH e. the weaker acid has higher bond energies, like HF vs HCl. ____ 4. The strongest organic acid in the following list is (where R = alkyl group) a. R-CH 3 . b. R-CHO. c. R-COOH. d. R-NH 2 . e. R-OH. ____ 5. Calculate the pH of a solution where [OH - ] = 4.6 10 -4 . Is this solution acidic or basic? a. 3.34; acidic b. 3.34; basic c. 9.40; basic d. 10.66; acidic e. 10.66; basic ____ 6. Ammonium perchlorate is the salt of a weak base, ammonia, and a strong acid, perchloric acid. Which statement about a solution of ammonium perchlorate is correct? a. It is strongly acidic. b. It is weakly acidic. c. It is neutral. d. It is weakly basic. e. We cannot predict its acid-base properties without more information. ____ 7. A buffer solution is 0.080 M in lactic acid (K a = 1.8 10 -4 ) and 0.070 M in sodium lactate. The pH of the solution is
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2005 Exam03 - CHE 132 Spring 2005 Midterm Exam 3 Multiple...

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