Chemistry

Problem

Calculate the

E^\circ

for the reaction

\text{ZnY}^{2-} + 2e^- \rightleftharpoons \text{Zn}(s) + Y^{4-}

, where

Y^{4-}

is the completely deprotonated anion of EDTA. The formation constant for

\text{ZnY}^{2-}

is :

3.2 \times 10^{16}

and

E^\circ

for

\text{Zn} \rightarrow \text{Zn}^{2+} + 2e^-

0.76 \text{ V}

-1.25 \text{ V}

0.48 \text{ V}

+0.68 \text{ V}

-0.27 \text{ V}