EBK CHEMISTRY
1st Edition
ISBN: 9780133888584
Author: Tro
Publisher: VST
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Chapter 23, Problem 74E
Calculate the solubility of Zn(OH)2(s) in 2.0 M NaOH solution. (Hint. You must take into account the formation of Zn(OH)42- , which has a Kf= 2 × 1015.)
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Consider the insoluble compound cobalt(II) carbonate, CoCO3. The cobalt(II) ion also forms a complex with ammonia. Write a balanced net ionic
equation to show why the solubility of CoCO3 (s) increases in the presence of ammonia and calculate the equilibrium constant for this reaction.
For Co(NH3)62+, Kf = 1.3x105. Be sure to specify states such as (aq) or (s).
Knet =
Calculate the solubility of Zn(OH)2(s) in 2.0 M NAOH solution.
(Hint: You must take into account the formation of Zn(OH),,
which has a K = 2 x 105.)
Cobalt (II) carbonate is slightly soluble in water (Ksp = 1.0 x 10-10). In the presence of an excess of ammonia, Co²+ forms a complex with six ammonia ligands that is somewhat
favorable (K₁ = 1.3 x 105). What is the value of the equilibrium constant (Koverall) for the overall reaction that occurs?
COCO3 (s) +6 NH3 (aq) → Co(NH)32+ (aq) + CO32- (aq)
1.3 x 10-5
3.6 x 10²
7.7 x 10-16
1.3 x 105
1.0 x 10-10
Chapter 23 Solutions
EBK CHEMISTRY
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