Physics · Internal resistance, potential difference and emf of a cell, a combination of cells in series and parallel
A cell constructed by coupling a standard copper electrode and a standard magnes
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 the copper electrode is +0.34 volt, that of magnesium electrode is:
- A. +3.04 volts
- B. -3.04 volts
- C. +2.36 volts
- D. -2.36 volts
Step-by-step solution
The cell emf (2.7 V) equals the reduction potential of the cathode (copper, +0.34 V) minus that of the anode (magnesium). Thus, 2.7 = 0.34 - E_Mg, solving gives E_Mg = -2.36 V.
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