Zn(OH)2 = Zn2+ + 2OH-
[Zn2+] = Ksp / [OH-]2 = 3x10-16 / (0.0200)2 = 7.5x10-13 M
Zn2+ + 2e = Zn
E = -0.763 - 0.0592/2 x log(1/7.5x10-13) = -1.09 V
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