Formula for the Overall Cell Potential is ; E0cell=E0red−E0oxid
E0cell = Measured cell potential
E0red = Sum of the reduction potential ( cathode )
E0oxid = Oxidation potential ( anode )
Calculated value of cell potential can differ from the Measured Cell potential because of the cell impurities, value differences during the calibration of voltage or concentration.
Measured potential of a cell is normally less than the ideal or nominal volts. This is because of the voltage which is specified for the ideal conditions for a new unused cell. The conditions mention temperature, atmospheric pressure, presume sound unaffected condition of electrode plates as also pure electrolytes etc.
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