P4: Polarographic Half-Wave Potentials

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Nov 3, 2020
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- P3: Activity Series of Metals
- Equilibrium Constants

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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⁺ + 3e⁻ ⇋ Al(s)	–0.5	0.2 M acetate (pH 4.5–4.7)
Cd²⁺ + 2e⁻ ⇋ Cd(s)	–0.60	0.1 M KCl 0.05 M H₂SO₄ 1 M HNO₃
Cr³⁺ + 3e⁻ ⇋ Cr(s)	–0.35 (+3 → +2) –1.70 (+2 → 0)	1 M NH₄Cl plus 1 M NH₃ 1 M NH₄⁺/NH₃ buffer (ph 8–9)
Co³⁺ + 3e⁻ ⇋ Co(s)	–0.5 (+3 → +2) –1.3 (+2 → 0)	1 M NH₄Cl plus 1 M NH₃
Co²⁺ + 2e⁻ ⇋ Co(s)	–1.03	1 M KSCN
Cu²⁺ + 2e⁻ ⇋ Cu(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⁺ + 3e⁻ ⇋ Fe(s)	–0.17 (+3 → +2) –1.52 (+2 → 0)	0.5 M sodium tartrate (pH 5.8)
Fe³⁺ + e⁻ ⇋ Fe²⁺	–0.27	0.2 M Na₂C₂O₄ (pH < 7.9)
Pb²⁺ + 2e⁻ ⇋ Pb(s)	–0.405 –0.435	1 M HNO₃ 1 M KCl
Mn²⁺ + 2e⁻ ⇋ Mn(s)	–1.65	1 M NH₄Cl plus 1 M NH₃
Ni²⁺ + 2e⁻ ⇋ Ni(s)	–0.70 –1.09	1 M KSCN 1 M NH₄Cl plus 1 M NH₃
Zn²⁺ + 2e⁻ ⇋ Zn(s)	–0.995 –1.33	0.1 M KCl 1 M NH₄Cl plus 1 M NH₃

Contributors and Attributions

David Harvey (DePauw University)

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