Cặp oxy hóa khử Zn2+ /Zn có thế điện cực theo phương trình Nernat là:

\[{\varepsilon _{Z{n^{2 + }}/Zn}} = {\varepsilon ^0}_{Z{n^{2 + }}/Zn} - \frac{{RT}}{{2F}}\lg \frac{{\left[ {Z{n^{2 + }}} \right]}}{{\left[ {Zn} \right]}}\]

\[{\varepsilon _{Z{n^{2 + }}/Zn}} = {\varepsilon ^0}_{2H/{H_2}} - \frac{{RT}}{F}\lg \frac{{\left[ {Z{n^{2 + }}} \right]}}{{\left[ {Zn} \right]}}\]

\[{\varepsilon _{Z{n^{2 + }}/Zn}} = {\varepsilon ^0}_{Z{n^{2 + }}/Zn} + \frac{{RT}}{F}\lg \frac{{\left[ {Z{n^{2 + }}} \right]}}{{\left[ {Zn} \right]}}\]

\[{\varepsilon _{Z{n^{2 + }}/Zn}} = {\varepsilon ^0}_{Z{n^{2 + }}/Zn} + \frac{{RT}}{{2F}}\lg \frac{{\left[ {Z{n^{2 + }}} \right]}}{{\left[ {Zn} \right]}}\]