IUPAC > Gold Book > alphabetical index > I > ionic strength, I


ionic strength, I

On a molality basis,
I m = 1 2 ∑ m B z B 2
where the sum goes over all the ions B. z B is the charge number of ion B. The ionic strength on a concentration basis is defined analogously
I c = 1 2 ∑ c B z B 2.
PAC, 1996, 68, 957 (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 977
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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. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.I03180.
Original PDF version: http://www.iupac.org/goldbook/I03180.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 The PDF version is out of date and is provided for reference purposes only.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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