Chapter 19, Problem 97AP

Zinc is an amphoteric metal; that is, it reacts with both acids and bases. The standard reduction potential is -1.36 V for the reaction:

${\text{zn(OH)}}_4^{2-}(aq)+2e^{-}\to \text{ zn(}s\text{)}+4{\text{ OH}}^{\text{-}}(aq)$

Calculate the formation constant $(K_{\text{f}})$ for the reaction:

${\text{Zn}}^{\text{2+}}(aq)+4{\text{OH}}^{\text{-}}(aq)\rightleftarrows {\text{Zn(OH)}}_4^{2-}(aq)$