Comparison of Reference Electrodes

Reference Electrode
Voltage Difference
Structure/electrolyte potential equivalent to –0.850 volts with respect to copper/copper sulfate To convert reference potential measurements to the equivalent potential with respect to copper/copper sulfate
Copper/Copper Sulfate 0 -0.850 volt
Silver/Silver Chloride -50 mv -0.800 volt Subtract 0.050 volts
Standard Calomel -70 mv -0.780 volt Subtract 0.070 volts
Zinc -1100 mv +0.250 volts Subtract 1.10 volts
Comparison of different electrodes @ 25° C

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