Answer
See the answer below.
Work Step by Step
$K_f=2.0\cdot10^{38}$
$1/K_f=[Au^+][CN^-]^2/[[Au(CN)_2^-]]$
$[Au^+]=1.09\cdot10^{-38}\ M$
Yes it is reasonable to assume all gold is in the complex ion.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 17 Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria - 17-7 Solubility and Complex Ions - Applying Chemical Principles - Questions - Page 675: 3
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