જ્યારે કોષ સંપૂર્ણ ડિસ્ચાર્જે થાય ત્યારે $E_{cell} = 0 $ થાય.
$\therefore \,\,\,{E_{cell}} = \,\,\frac{{0.0592}}{2}\,\,\log \,\,\frac{{[Z{n^{2 + }}]}}{{[C{u^{2 + }}]}}$
$\,\,\therefore \,\,\,\frac{{1.10}}{{0.0296}}\,\, = \,\,{\log _{10}}\,\,\frac{{[Z{n^{2 + }}]}}{{[C{u^{2 + }}]}}$
$[\therefore \,\,37.5\,\, = \,\,{\log _{10}}\,\frac{{[Z{n^{2 + }}]}}{{[C{u^{2 + }}]}}\,\,\,\,\,\therefore \,\,\frac{{[Z{n^{2 + }}]}}{{[C{u^{2 + }}]}}\,\, = \,\,{10^{37.3}}]$
$Pt | H_2\,(g) | H^{+}_{(aq)} (10^{-8}\, M) | | H^{+}_{(aq)} (0.001\,M) | H_2\,(g) | Pt$