= Revised Release on the Ionization Constant of H2O (2024) by IAPWS
{c}
{tag=Work by International Association for the Properties of Water and Steam}
{title2=2024}
IAPWS R11-24, adopted June 2024. The International Association for the Properties of Water and Steam publishes the formulation.
https://iapws.org/technical-guidance/release/Ionization
https://iapws.org/technical-guidance/release/Ionization.download[Full seven-page release]
Nomenclature and section 3 declare a dimensionless ionization constant, molal ionic standard states and a mole-fraction water standard state. Section 6, Table 3 gives temperature- and pressure-dependent values; the near-ambient 25-degree value is approximately ten to the minus fourteen.
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