Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 15 - Additional Aqueous Equilibria - Questions for Review and Thought - Topical Questions - Page 693c: 73a


Chemical equation for the formation of this complex ion. $Ag^+(aq) + 2CN^-(aq) \lt -- \gt [Ag(CN)_2]^-(aq)$ Formation constant expression: $K_f = \frac{[[Ag(CN)_2]^-]}{[Ag^+][CN^-]^2}$

Work Step by Step

1. Identify the cation and the anion, and balance their coefficients: $[Ag(CN)_2]^-$ Cation: $1 Ag^+$ Anion: $2 CN^-$ Now, write the chemical equation: $Ag^+(aq) + 2CN^-(aq) \lt -- \gt [Ag(CN)_2]^-(aq)$ 2. To write the formation constant expression: $K_f = \frac{[Products]}{[Reactants]} = \frac{[[Ag(CN)_2]^-]}{[Ag^+][CN^-]^2}$
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