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F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
In chromatography , for a particular solvent, it is equal to the ratio of its molar concentration in the stationary phase to its molar concentration in the mobile phase , also approximating the ratio of the solubility of the solvent in each phase.
The term is often confused with partition coefficient or distribution coefficient .
Expression
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The ratio of activities of a solute , A in an aqueous /organic system will remain constant and independent of the total quantity of A (hence
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{\displaystyle [A ]_{org}\propto [A ]_{aq}}
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o r g
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{\displaystyle (K_{D})_{A}={(aA )_{org} \over (a_{A})_{aq}}\approx {[A ]_{org} \over [A ]_{aq}}}
Distribution constants are useful as they allow the calculation of the concentration of remaining analyte in the solution, even after a number of solvent extractions have occurred. They also provide guidance in choosing the most efficient way to conduct an extractive separation .
Thus, the concentration of A remaining in an aqueous solution after i
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{\displaystyle [A ]_{i}=\left({V_{aq} \over V_{org}K_{D}+V_{aq}}\right)^{i}[A ]_{0}}
(where [A ]i aq millilitres of solution with the original concentration of [A ]0 with i org ).
References
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^ Dettmer-Wilde K, Engewald W (5 November 2014). Practical Gas Chromatography: A Comprehensive Reference ISBN 978-3-642-54640-2
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Prominent publications
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Distribution_constant&oldid=1170069135 " C a t e g o r y : ● C h r o m a t o g r a p h y
● T h i s p a g e w a s l a s t e d i t e d o n 1 3 A u g u s t 2 0 2 3 , a t 0 1 : 1 2 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
![{\displaystyle [A]_{org}\propto [A]_{aq}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/1d996bf761ee7079e170b8a94fd3f3a6bb63a6a8)
![{\displaystyle (K_{D})_{A}={(aA)_{org} \over (a_{A})_{aq}}\approx {[A]_{org} \over [A]_{aq}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5c669fb1edb9ff07b15b57179aa71725a62106bb)
![{\displaystyle [A]_{i}=\left({V_{aq} \over V_{org}K_{D}+V_{aq}}\right)^{i}[A]_{0}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/3db8d36364746bb883df42eb890109f9afab1ddf)
