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: 61


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Work Step by Step

The number of moles of salt: $10.8\ g\div 49.01\ g/mol=0.22\ mol$ Molarity: $0.22\ mol\div 0.5\ L=0.44\ M=[Na^+]$ Net ionic reaction: $CN^-+H_2O\leftrightarrow HCN+OH^-$ $K=[HCN][OH^-]/[CN^-]=K_w/K_a$ $1\cdot10^{-14}\div4\cdot10^{-10}=x\cdot x/(0.44-x)$ $x=0.0033\ M=[HCN]=[OH^-]$ $[CN^-]=0.437\ M$ $[H_3O^+]=K_w/[OH^-]=3.03\cdot10^{-12}\ M$
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