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Chemistry LibreTexts

16.15: Polarographic Half-Wave Potentials

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The following table provides E1/2 values for selected reduction reactions. Values are from Dean, J. A. Analytical Chemistry Handbook, McGraw-Hill: New York, 1995.

Element E1/2 (volts vs. SCE) Matrix
Al3+(aq)+3eAl(s) –0.5 0.2 M acetate (pH 4.5–4.7)
Cd2+(aq)+2eCd(s) –0.6

0.1 M KCl

0.050 M H2SO4

1 M HNO3

Cr3+(aq)+3eCr(s)

–0.35 (+3+2)

–1.70 (+20)

1 M NH4Cl plus 1 M NH3

1 M NH4+/NH3 buffer (pH 8–9)

Co3+(aq)+3eCo(s)

–0.5 (+3+2)

–1.3 (+20)

1 M NH4Cl plus 1 M NH3
Co2+(aq)+2eCo(s) –1.03

1 M KSCN

Cu2+(aq)+2eCu(s)

0.04

–0.22

0.1 M KSCN

0.1 M NH4ClO4

1 M Na2SO4

0.5 M potassium citrate (pH 7.5)

Fe3+(aq)+3eFe(s)

–0.17 (+3+2)

–1.52 (+20)

0.5 M sodium tartrate (pH 5.8)
Fe3+(aq)+eFe2+(aq) –0.27 0.2 M Na2C2O4 (pH < 7.9)
Pb2+(aq)+2ePb(s)

–0.405

–0.435

1 M HNO3

1 M KCl

Mn2+(aq)+2eMn(s) –1.65 1 M NH4Cl plus 1 M NH3
Ni2+(aq)+2eNi(s)

–0.70

–1.09

1 M KSCN

1 M NH4Cl plus 1 M NH3

Zn2+(aq)+2eZn(s)

–0.995

–1.33

0.1 M KCl

1 M NH4Cl plus 1 M NH3


16.15: Polarographic Half-Wave Potentials is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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