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IAPWS R11-07
Release on the Ionization Constant of H2O
August 2007

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This formulation is recommended for the calculation of the ionization constant of ordinary water as a function of temperature and density. The range of validity is from 0 to 800 °C at densities up to 1.25 g m−3.
The development of the formulation and comparisons to available data are described in detail in a scientific article.

Revision History

This Release is the product of the Working Groups "Thermophysical Properties of Water and Steam" (TPWS) and "Physical Chemistry of Aqueous Systems" (PCAS) of the International Association for the Properties of Water and Steam (IAPWS).

This page updated June 7, 2018

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