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Don·nan equilibrium

n :  the ionic equilibrium reached in a solution of an electrolyte whose ions are diffusible through a semipermeable membrane but are distributed unequally on the two sides of the membrane because of the presence of a nondiffusible colloidal ion (as a protein ion) on one side of the membrane
 
Donnan, Frederick George (1870-1956),
British chemist. A university professor for most of his career, Donnan made important contributions as a colloid chemist. Apart from the theory of membrane equilibrium named after him, he did research during World War I on chemical warfare and nitrogen products. He did early research on synthetic ammonia and nitric acid and helped in the development of mustard gas.
 
 

 
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