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What mass of solid NaOH must be added to 1.0 L of water at 25*C in...

What mass of solid NaOH must be added to 1.0 L of water at 25*C in order to dissolve 10.0 g of Zn(OH)2 (Ksp=4.5x10-17) according to the following reaction?

Zn(OH)2 (s) + 2OH- (aq) ------> Zn(OH)42- (aq)

The formation constant for Zn(OH)42- is Kf=2.8x1015.

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Answer #1

Molecular weight of Zn(OH)2 = 99.4 g

Molecular weight of Zn(OH)2-4 = 133.4 g

Molecular weight of NaOH = 40 g

So 1.56*10-3 g of solid NaOH is required.

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