How are the concentrations of protons and hydroxide ions involved in the half-reaction taken into account when calculating

How are the concentrations of protons and hydroxide ions involved in the half-reaction taken into account when calculating the electrode potential of a given redox pair?

When calculating the electrode potential of a given redox pair, the concentrations of protons and hydroxide ions are raised to powers corresponding to the stoichiometric half-reaction coefficients.

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