Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 16 Principles of Chemical Reactivity: The Chemistry of Acids and Bases - Study Questions - Page 629d: 63


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Work Step by Step

The number of moles of acetic acid: $0.15\ M\times 22/1000\ L=3.3\cdot10^{-3}\ mol$ New molarity: $3.3\cdot10^{-3}\ mol\div 44/1000\ L=0.075\ M$ Net ionic reaction: $CH_3CO_2^-+H_2O\leftrightarrow CH_3CO_2H+OH^-$ $K_b=[ CH_3CO_2H][OH^-]/[CH_3CO_2^-]$ $5.6\cdot10^{-10}=x^2/(0.075-x)$ $x=6.48\cdot10^{-6}\ M=[OH^-]$ $pH=14+log([OH^-])=8.81$ $[H_3O^+]=10^{-pH}=1.54\cdot10^{-9}\ M$
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