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The Λ 0  and association constants of salts of some widely used drugs (pharmacological agents) in acetonitrile have been determined. The division of Λ 0  into single ion values λ 0  +  and λ 0  −  has been made using λ 0  Na⁺  and λ 0  Cl⁻  values from the literature. The λ 0  +  and λ 0  −  values have been found to be considerable in acetonitrile. The results suggest that many of the drugs can be present both as dissociated ions as well as associated molecules which are capable of absorption, dissociation and conduction (of ionic forms) in the lipid layers at very low concentrations. The phenomenon of unsolvation has been utilized to calculate the real dimensions of the drug ions (cations or anions) which are difficult to calculate from bond distances due to their large size and coiled configuration in aqueous solutions.

Real Dimensions of the Drug Ions from Conductometric Studies of Drugs (Present as Salts) in Acetonitrile