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The solubility product constant for Zn(OH)2 is Ksp=3.00*10^-16 The formation constant for the hydroxo complex Zn(OH)4^2-...

The solubility product constant for Zn(OH)2 is Ksp=3.00*10^-16

The formation constant for the hydroxo complex Zn(OH)4^2- is Kf=4.60*10^17

When Zn(OH)2(s) was added to 1.00 L of a basic solution, 1.19

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Answer #1

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Zn(OH)2 (s) Zn2+ (aq) + 2OH- (aq) Ksp = 3X10-16

Zn 2+(aq) + 4OH- (aq) Zn(OH)42- (aq) Kf = 4.6 x 10 17

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Zn(OH)2 (s) + 2 OH- (aq)           Zn(OH)42- (aq) Ktot = Ksp x Kf = 165.6

Zn(OH)2 (s) OH- (aq) Zn(OH)42- (aq)
ni --- A
nrx --- -2(1.19x10-2) +1.19x10-2
nfinal --- A - 0.0238 1.19x10-2

Ktot = [Zn(OH)42-]/[OH]2 = 165.6

Kt = 1.19x10-2 / ( A- 0.0238) = 165.6

A = (1.19x10-2 / 165.6)1/2 + 0.0238 = 0.03228 M

[OH] = A -0.0238 = 0.03228-0.0238 = 8.48E-3

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