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: 73b


$1 Cd^{2+}(aq) + 4 NH_3(aq) \lt -- \gt 1 [Cd(NH_3)_4]^{2+}$ $K_f = \frac{[[Cd(NH_3)_4]^{2+}]^1}{[Cd^{2+}]^1[NH_3]^4}$

Work Step by Step

1. Identify the separate compounds and their quantities in this complex ion: - 1 $Cd^{2+}$ - 4 $NH_3$ 2. Write the equation where they combine to formate the complex ion $[Cd(NH_3)_4]^{2+}$ $1 Cd^{2+}(aq) + 4 NH_3(aq) \lt -- \gt 1 [Cd(NH_3)_4]^{2+}$ 3. Write the formation constant expression: - It will be: the concentrations of the products divided by that of the reactants: - And remember: the balance coefficients will be the exponents of their concentrations. $K_f = \frac{[Products]}{[Reactants]}$ $K_f = \frac{[[Cd(NH_3)_4]^{2+}]^1}{[Cd^{2+}]^1[NH_3]^4}$
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