Chemistry: Molecular Approach (4th Edition)

Published by Pearson
ISBN 10: 0134112830
ISBN 13: 978-0-13411-283-1

Chapter 16 - Section 16.6 - Finding the [H3O+] and pH of Strong and Weak Acid Solutions - Conceptual Connection - Page 741: 16.5


(c) initial [HA]= 0.0100 M; $K_a$ = $1.0 \times 10^{-3}$

Work Step by Step

The $x \space is \space small$ approximation is least likely to work in solutions with lower initial acid concentration and "big" $K_a$ values. This happens because the approximation depends on the percent ionization of the acid (it must be low). This percent ionization increases when the inital acid concentration decreases and the $K_a$ of the acid increases. (c) is the alternative with the lowest initial concentration and the greatest $K_a$, so it is definitely the least likely to work with this approximation.
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