Reference Electrode Potentials

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Hg2Cl2(s) + 2e- == 2Hg(liq) + 2Cl-


Table 1. Potential of the calomel Electrode at 25°C
Conditions vs NHE vs SCE LJ Reference
Hg/Hg2Cl2, KCl (0.1M) 0.3337 0.0925 - 1,3
Hg/Hg2Cl2, KCl (0.1M) 0.336 0.092 Yes 2
Hg/Hg2Cl2, KCl (1M) NCE (Normal Calomel) 0.2801 0.0389 - 1,3
Hg/Hg2Cl2, KCl (1M) NCE (Normal Calomel) 0.283 0.039 Yes 2
Hg/Hg2Cl2, KCl (3.5M) 0.250 0.006 Yes 2
Hg/Hg2Cl2, KCl (sat'd) SCE (Sat'd Calomel) 0.2412 0 - 1,3
Hg/Hg2Cl2, KCl (sat'd) SCE (Sat'd Calomel) 0.244 0 Yes 2
Hg/Hg2Cl2, NaCl (sat'd) 0.2360 -0.0052 - 1

NOTES