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The meaning of logK in the database
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Topic: The meaning of logK in the database (Read 183 times)
Mr.white
Frequent Contributor
Posts: 18
The meaning of logK in the database
«
on:
August 31, 2024, 12:49:16 PM »
In the database, does the definition of logK refer to the solubility data of a species at different temperatures under 1 atmosphere, fitted into this formula? logK=A1+A2*T+A3/T+A4*logT+A5/T2
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dlparkhurst
Top Contributor
Posts: 3682
Re: The meaning of logK in the database
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Reply #1 on:
August 31, 2024, 03:23:59 PM »
Yes. It is called an "analytical expression" in the documentation, and it is used whenever it is defined for an aqueous species or phase. If there is no analytical expression, the delta_H is used in the Van't Hoff expression to determine the temperature dependence of the log_k. If neither Van't Hoff nor analytical expression are defined, the log_k is constant at all temperatures.
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The meaning of logK in the database