Derivative analysis of potentiometric titration data to obtain protonation constants

Journal Article · Fri Nov 15 00:00:00 EST 1996 · Analytical Chemistry (Washington)

DOI:https://doi.org/10.1021/ac960138t· OSTI ID:420700

Chen, J F; Xia, Y X; Choppin, G R ^[1]

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1. Florida State Univ., Tallahassee, FL (United States)

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{sup +}, OH{sup -}, and H{sub m}A. The data for titration of acetic acid and 8-hydroxyquinoline in 0.10-5.0 m NaCl media are 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{sub m} + b, where pcH = -log[H{sup +}], pH{sub m} is the pH meter reading. 31 refs., 3 figs., 6 tabs.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 420700
• Journal Information: Analytical Chemistry (Washington), Vol. 68, Issue 22; Other Information: PBD: 15 Nov 1996
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ELECTRODES
CALIBRATION
EXPERIMENTAL DATA
TITRATION
CHEMICAL ANALYSIS
POTENTIOMETRY
GLASS
PH VALUE
MEASURING METHODS
CALCULATION METHODS
IONIC POTENTIAL
IONIZATION