Thermodynamic Quantities for the Ionization Reactions of Buffers

Published

June 1, 2002

Author(s)

Robert N. Goldberg, N Kishore, R M. Lennen

Abstract

This review contains selected values of thermodynamic quantities for the aqueous ionization reactions of 63 buffers, many of which are used in biological research. Since the aim is to be able to predict values of the ionization constant at temperatures not too far from ambient, the thermodynamic quantities which are tabulated are the pK, standard molar Gibbs energy δ_rG , standard molar enthalpy δ_rH and standard molar heat-capacity change δ_rC_p for each of the ionization reactions at the temperature T = 298.15 K and the pressure p = 0.1 MPa. The standard state is the hypothetical ideal solution of unit molality. The chemical name(s) and CAS registry number, structure, empirical formula, and molecular weight are given for each buffer considered herein. The selection of thermodynamic data for each buffer is discussed.

Citation

J. Phys. & Chem. Ref. Data (JPCRD) -

Volume

31

Issue

No. 2

NIST Pub Series

J. Phys. & Chem. Ref. Data (JPCRD)

Pub Type

NIST Pubs

Keywords

buffers, enthalpy, equilibrium constant, evaluated data, Gibbs free energy, heat capacity, ionization, pK, thermodynamic properties

Citation

Goldberg, R. , Kishore, N. and Lennen, R. (2002), Thermodynamic Quantities for the Ionization Reactions of Buffers, J. Phys. & Chem. Ref. Data (JPCRD), National Institute of Standards and Technology, Gaithersburg, MD (Accessed April 23, 2024)