An electrochemical cell is composed of pure copper and pure lead electrodes immersed in solutions of their respective divalent ions.

For a $0\mathrm{.}3M$ concentration of $C{u}^{2+},$ the lead electrode is oxidized yielding a cell potential of $0\mathrm{.}500V.$ Calculate the concentration of $P{b}^{2+}$

ions if the temperature is $25C.$ The standard potentials for $Cu$ and $Pb$ are $+0\mathrm{.}340V$ and $-0\mathrm{.}126V.$

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