ch16probs2.1 - Solomons Study Notes General Chemistry CHE...

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S olomon’s Study Notes General Chemistry CHE 132 Spring 2009 Midterm 2 Solomon Weiskop PhD Chapter 16 Practice Problems (Acids & Bases 2)
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Study Notes & Practice Problems are available to print out by registering at www.solomonlinetutor.com Solomon Weiskop PhD Solomon’s CHE 1 32 Tutoring © Copyright 2009
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1 Problems numbered in blue were written by Prof. Hanson. [#1] A wine sample has a pH of 3.52. This corresponds to [H 3 O + ] = ____ (a) 5.2 × 10 4 M (b) 3.3 × 10 11 M (c) 3.0 × 10 4 M (d) 3.3 × 10 3 M (e) 5.2 × 10 3 M [#2] Given the following equation H 2 O( ° ) + HPO 4 2- (aq) H 2 PO 4 -1 (aq) + OH -1 (aq) Which one of the following statements is correct? (a) H 2 O is an acid and OH - is its conjugate base (b) HPO 4 2- is an acid because it is a proton acceptor (c) H 2 O is a base and OH - is its conjugate acid (d) H 2 O is a Lewis base because it is an electron pair donor (e) H 2 O is a Lewis acid because it is an electron pair acceptor [#3] A 0.20M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 × 10 4 M . What is the equilibrium constant K a ? (a) 2.5 × 10 4 (b) 5 × 10 3 (c) 2.5 × 10 6 (d) 1.25 × 10 6 (e) 5.× 10 2 [#4] Methylamine CH 3 NH 2 acts as a weak base in water. The products of the reaction are ____ and _____. (a) H 3 O + and CH 3 NH - (b) OH - and CH 3 NH 3 + (c) OH - and CH 3 NH - (d) H 3 O + and OH - (e) H 3 O + and CH 3 NH 3 + [#5] Calculate the pH of a solution where OH ± = 4.6 × 10 4 . Is this solution acidic or basic? (a) 10.66 acidic (b) 9.40 basic (c) 3.34 basic (d) 3.34 acidic (e) 10.66 basic [#6] Which of the following is not a conjugate acid-base pair? (a) CH 3 COOH and CH 3 COO - (b) CH 3 NH 3 + and CH 3 NH 2 (c) H 2 SO 3 and HSO 4 - (d) HPO 4 2- and PO 4 3- (e) HCOOH and HCOO -
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2 [#7] Which of the following is neither a strong acid nor a strong base? (a) H 2 CO 3 (b) HNO 3 (c) H 2 SO 4 (d) NaOH (e) KOH [#8] The pH of a popular soft drink is 3.4. What is its hydronium ion concentration? (a) 5.0 × 10 4 M (b) 4.0 × 10 4 M (c) 2.5 × 10 3 M (d) 1 . 0 × 10 7 M (e) 5.0 × 10 5 M [#9] Which of the following does not act as a Bronsted-Lowry acid? (a)
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ch16probs2.1 - Solomons Study Notes General Chemistry CHE...

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