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8.124 SECTION 8<br />

8.6 ELECTRODE POTENTIALS<br />

TABLE 8.27<br />

Potentials of the Elements and Their Compounds at 25C<br />

Standard potentials are tabulated except when a solution composition is stated; the latter are formal potentials<br />

and the concentrations are in mol/liter.<br />

Half-reaction<br />

Standard<br />

or formal<br />

potential<br />

Solution<br />

composition<br />

Actinium<br />

Ac 3 3e Ac 2.13<br />

Aluminum<br />

Al 3 3e Al 1.676<br />

3 <br />

AlF6 3e Al 6F<br />

2.07<br />

<br />

Al(OH) 4 3e Al 4OH<br />

2.310<br />

Americium<br />

2 4<br />

AmO2 4H 2e Am 2H2O<br />

1.20<br />

2 <br />

AmO2 e AmO2 1.59<br />

4<br />

AmO2 4H e Am 2H2O<br />

0.82<br />

3<br />

AmO2 4H 2e Am 2H2O<br />

1.72<br />

Am 4 e Am 3 2.62<br />

Am 4 4e Am 0.90<br />

Am 3 3e Am 2.07<br />

Antimony<br />

<br />

Sb(OH) 4 2e SbO2 2OH 2H2O<br />

0.465 1 NaOH<br />

<br />

SbO2 2H2O 3e Sb 4OH<br />

0.639 1 NaOH<br />

Sb 3H 2 O 3e SbH 3 3OH 1.338 1 NaOH<br />

Sb 2 O 5 6H 4e 2SbO 3H 2 O 0.605<br />

Sb 2 O 5 4H 4e Sb 2 O 3 2H 2 O 0.699<br />

Sb 2 O 5 2H 2e Sb 2 O 4 H 2 O 1.055<br />

Sb 2 O 4 2H 2e Sb 2 O 3 H 2 0.342<br />

SbO 2H 3e Sb H 2 O 0.204<br />

Sb 3H 3e SbH 3 0.510<br />

Arsenic<br />

H 3 AsO 4 2H 2e HAsO 2 2H 2 O 0.560<br />

HAsO 2 3H 3e As 2H 2 O 0.240<br />

As 3H 3e AsH 3 0.225<br />

3 <br />

AsO4 2H 2e AsO2 4OH<br />

0.67<br />

<br />

AsO2 2H2O 3e As 4OH<br />

0.68<br />

As 3H 2 O 3e AsH 3 3OH 1.37<br />

Astatine<br />

HAtO 3 4H 4e HAtO 2H 2 ca. 1.4<br />

2HAtO 2H 2e At 2 2H 2 O ca. 0.7<br />

At 2 2e 2At 0.20<br />

Barium<br />

BaO 2 4H 2e Ba 2 2H 2 O 2.365<br />

Ba 2 2e Ba 2.92<br />

Source: A. J. Bard, R. Parsons, and J. Jordan (eds.), Standard Potentials in Aqueous Solution (prepared under the auspices<br />

of the International Union of Pure and Applied Chemistry), Marcel Dekker, New York, 1985; G. Charlot et al., Selected Constants:<br />

Oxidation-Reduction Potentials of Inorganic Substances in Aqueous Solution, Butterworths, London, 1971.

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