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The calibration equation for potentiometry is: E = E° + (RT/nF) * ln[A], where E is the measured potential, E° is the standard potential, R is the gas constant (8.314 J/mol·K), T is the absolute temperature (K), n is the number of electrons transferred in the electrode reaction, F is the Faraday constant (96,485 C/mol), and [A] is the concentration of the analyte.