Chemistry Practice Problems Ksp Practice Problems Solution: What is the pH of a saturated solution of Zn(OH)2?...

Solution: What is the pH of a saturated solution of Zn(OH)2? Ksp=1.8x10-14

Problem

What is the pH of a saturated solution of Zn(OH)2? Ksp=1.8x10-14

Solution

Zn(OH)2(s)  Zn2+(aq) + 2 OH(aq)




The Ksp expression for Zn(OH)2 is:


Ksp=productsreactants=[Zn2+][OH-]2



Calculate OH- concentration:


Ksp=(x)(2x)2Ksp=x(4x2)


Ksp=4x3

1.8×10-144=4x344.5×10-153=x33


x = 1.651 × 10–5 M

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