Diaeresis (diacritic): Difference between revisions

Revision as of 14:15, 31 January 2014

The distribution constant (or partition ratio), is the equilibrium constant for the distribution of an analyte in two immiscible solvents.^[1] 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, and is often represented by K_D.

Expression

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 $[A]_{o r g} \propto [A]_{a q}$ ), so at any given temperature:

$(K_{D})_{A} = \frac{(a_{A})_{o r g}}{(a_{A})_{a q}} \approx \frac{[A]_{o r g}}{[A]_{a q}}$

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 extractions with an organic solvent can be found using:

$[A]_{i} = (\frac{V_{a q}}{V_{o r g} K_{D} + V_{a q}})^{i} [A]_{0}$

(where [A]_i is the concentration of A remaining after extracting V_aq millilitres of solution with the original concentration of [A]₀ with i portions of the organic solvent, each with a volume of V_org).

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

IUPAC Definition of partition ratio

Template:Chromatography

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+The '''distribution constant''' (or '''partition ratio'''), is the [[equilibrium constant]] for the distribution of an [[analyte]] in two [[immiscible]] [[solvent]]s.<ref name=Rice1993>{{citation | last = Rice | first =  N. M. | year = 1993 | title = Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993) | journal = Pure and Applied Chemistry | volume = 65 | pages = 2373 | doi = 10.1351/pac199365112373 | last2 = Irving | first2 = H. M. N. H. | last3 = Leonard | first3 = M. A. | issue = 11 }}</ref> For a particular solvent, it is equal to the ratio of its [[molar concentration]] in the [[Stationary phase (chemistry)|stationary phase]] to its molar concentration in the [[mobile phase]], also approximating the ratio of the [[solubility]] of the solvent in each phase. The [[technical terminology|term]] is often confused with partition [[coefficient]] or distribution coefficient, and is often represented by K<sub>D</sub>.
+==Expression==
+The ratio of [[activity (chemistry)|activities]] of a [[solution|solute]], A in an [[aqueous]]/[[organic compound|organic]] system will remain constant and independent of the total [[quantity]] of A (hence <math>[A]_{org} \propto [A]_{aq}</math>), so at any given temperature:
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+<math>(K_D)_A = {(a_A)_{org} \over(a_A)_{aq}} \approx {[A]_{org} \over[A]_{aq}}</math>
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+Distribution constants are useful as they allow the calculation of the concentration of remaining analyte in the solution, even after a number of [[solvent extraction]]s have occurred. They also provide guidance in choosing the most efficient way to conduct an [[Liquid-liquid extraction|extractive separation]].
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+Thus, the concentration of A remaining in an aqueous solution after ''i'' extractions with an organic solvent can be found using:
+<math>[A]_i = ({V_{aq} \over V_{org} K_D + V_{aq}})^i [A]_0</math>
+(where [A]<sub>i</sub> is the concentration of A remaining after extracting V<sub>aq</sub> [[millilitre]]s of solution with the original concentration of [A]<sub>0</sub> with ''i'' portions of the organic solvent, each with a volume of V<sub>org</sub>).
+==References==
+{{Reflist}}
+==External links==
+*[http://goldbook.iupac.org/P04440.html IUPAC Definition of ''partition ratio'']
+{{chromatography}}
+[[Category:Chromatography]]

Diaeresis (diacritic): Difference between revisions

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