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laws of distribution

in precipitation

Also contains definition of: logarithmic distribution coefficient in precipitation

During the formation of a mixed crystal from a solution containing two components 'A' and 'B', the latter may be distributed according to the equation
K A , B = b ( a 0 − a ) a ( b 0 − b ).
In this homogeneous distribution, a 0 and b 0 are the respective concentrations in the solution before crystallization and a and b are the respective concentrations in the solution after crystallization. K A , B is usually called the separation factor. The term homogeneous distribution coefficient is not recommended. Alternatively the distribution of the micro-component may follow the equation of Doerner and Hoskins
ln ( a 0 a ) = λ ln ( b 0 b )
(logarithmic distribution) where λ is usually called the logarithmic distribution coefficient, the meaning of the other symbols remaining the same. Exactly homogeneous or logarithmic distributions are extreme cases and very seldom encountered.
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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.L03487.
Original PDF version: http://www.iupac.org/goldbook/L03487.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 The PDF version is out of date and is provided for reference purposes only.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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