DERIVATIVE ANALYSIS OF POTENTIOMETRIC TITRATION DATA TO OBTAIN PROTONATION CONSTANTS

摘要

A methodology is described to calibrate glass electrodes and to analyze potentiometric titration data to calculate protonation constants, The analysis uses the variation of dV/dpH with titrant addition in terms of two physical parameters which involve the concentrations of H+, OH-, and H(m)A. The data for titration of acetic acid and 8-hydroxyquinoline in 0.10-5.0 m NaCl media ape analyzed by this method to obtain the stoichiometric protonation constants of the acids, the ionization constants of water, and the parameters s and b in the pH electrode calibration equation, pcH = spH(m) + b, where pcH = -log [H+], and pH(m) is the pH meter reading.