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The standard reduction potential values, \( \mathrm{E}^{\mathrm{o}}\left(\mathrm{Bi}^{3+} \mid \mathrm{Bi}\right) \) and \( \mathrm{E}^{\circ}\left(\mathrm{Cu}^{2+} \mid \mathrm{Cu}\right) \) are \( 0.226 \mathrm{~V} \) and \( 0.344 \mathrm{~V} \) respectively. A mixture of salts of bismuth and copper at unit concentration each is electrolyzed at \( 25^{\circ} \mathrm{C} \). To what value can \( \left[\mathrm{Cu}^{2+}\right] \) be brought down before bismuth starts to deposit, in electrolysis?
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