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: 58


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Work Step by Step

$pH=-log([H_3O^+])$ $[H_3O^+]=10^{-pH}$ $[H_3O^+]=0.005\ M=[F^-]$ $K_a=[H_3O^+][F^-]/[HF]$ $7.2\cdot10^{-4}=0.005^2/(x-0.005)$ $x=0.0397\ M=[HF]_0$
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