Standard Reduction Potentials Tabulated
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A standard reduction potential is a half-reaction's potential written as a reduction, measured against the standard hydrogen electrode, tabulated for lookup and combination.
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Cu²⁺ + 2 e⁻ → Cu carries a standard reduction potential of +0.34 V, a fixed reference value.
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A tabulated potential describes the reduction as written — reversing it flips the sign, not the magnitude.