Abstract
Distribution equilibria of 2-(2-pyridylazo)-5-methylphenol (PAP-5-Me) and its zinc(II) chelate have been studied between two phases which were formed from a micellar solution of poly(oxyethylene)-4-nonylphenyl ether with 7.5 oxyethylene units (PONPE-7.5). One phase was rich in PONPE-7.5 and the other was the aqueous phase. The volume ratio of the former to the latter was about 0.6:49.5 under the present conditions. On the basis of the distribution curves for PAP-5-Me and zinc(II) as a function of pH, the acid dissociation constant of PAP-5-Me, the formation constasnt of the chelate, and the partition constants of PAP-5-Me and the chelate were determined at 293K and ionic strength of 0.1(NaCl).
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