Chemistry 10th Edition

Published by Brooks/Cole Publishing Co.
ISBN 10: 1133610668
ISBN 13: 978-1-13361-066-3

Chapter 19 - Ionic Equilibria II: Buffers and Titration Curves - Exercises - The Common Ion Effect and Buffer Solutions - Page 773: 7


(a) Buffer; (b) Not a buffer; (c) Buffer; (d) Not a buffer;

Work Step by Step

1. Identify the conjugate acid-base pairs for each solution. (It has to be a weak acid-base one.) (a) $CN^-$ and $HCN$; (b) Doesn't have one. (c) $NH_3$ and $N{H_4}^+$; (d) Doesn't have one. Since the solutions have similar concentrations for both acids and bases, (a) and (c) are buffers. (b) The common ion here is $Na^+$, which isn't a significant electrolyte. (c) The common ion here is $OH^-$, which is strong, so the solution can't be a buffer.
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