Dissociation constants of few overlapping dibasic acids in acetonitrile at 25 degrees C have been studied by potentiometric method Data were analyzed by computer program written in GW-BASIC for calculation of pK(a) values of overlapping dibasic acids. Because of ion pair formation the incomplete dissociation of the compound has been taken into account in the calculation of pK(a) values. The resolution of acid strength in acetonitrile relative to that in water has been determined for each compound by plotting the pK(a) values vs. percent composition of solvent. Gibb's free energy (Delta G(theta)) is also studied. The results show greater resolution in acetonitrile than in water.
S UDDIN ,A T MUFTI ,A W K KHANZADA ,
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