First slide

Standard EMF of a cell

Question

A cell constructed by coupling a standard copper electrode and a standard magnesium electrode has emf of 2.7 volts. If the standard reduction potential of copper electrode is +0.34 volt, that of magnesium electrode is

Moderate

Solution

since EMF of cell is positive reaction is spontaneous. This is possible only if SRP of cathode is greater than SRP of anode.
$E_{cell}^{0} = E_{{Cu}^{+ 2} | Cu}^{0} - E_{{Mg}^{+ 2} | Mg}^{0} 2.7 = 0.34 - E_{{Mg}^{+ 2} | Mg}^{0} E_{{Mg}^{+ 2} | Mg}^{} = 0.34 - 2.7 = - 2.36 V$

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