Cox–Yates equation

A modification of the Bunnett–Olsen equation of the form:

$log 10 ( [ SH + ] [ S ] ) − log 10 [ H + ] = m * X + pK SH +$

is the activity function

$log 10 ( γ S γ H + γ SH + )$

for an arbitrary reference base. The function $X$ is called the excess acidity because it gives a measure of the difference between the acidity of a solution and that of an ideal solution of the same concentration. In practice

$X = − ( H 0 + log 10 [ H + ] )$

and

$m * = 1 − Φ$ .

Source:

PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1101

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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.C01386.

Original PDF version: http://www.iupac.org/goldbook/C01386.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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