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- standard reduction potential
- The voltage attributed to a reductionThat part of a chemical reaction in which a reactant gains electrons; simultaneous oxidation of a reactant must occur. half-reactionA portion of an oxidation-reduction reaction involving only oxidation or only reduction. An oxidation half-reaction can be combined with a reduction half-reaction to give an overall equation; this is useful in balancing oxidation-reduction reactions. Each half-reaction can be assigned its own standard reduction potential; cell potentials can be calculated by combining these half-reaction potentials. under standard conditions; its value is given referenced to the standard hydrogen electrodeA system in which hydrogen (hydronium) ions and gaseous hydrogen are present in their standard states; used as a reference (of zero) for the values of standard reduction potentials.. Also called standard electrode potentialThe voltage attributed to a reduction half-reaction under standard conditions; its value is given referenced to the standard hydrogen electrode. Also called standard reduction potential..