PHYSICO-CHEMICAL STUDIES OF COMPLEX FORMATION BETWEEN MOLYBDIC AND TARTARIC ACIDS. PART V. ELECTROMETRIC STUDIES

When tartaric acid is added in increasing amounts to a definite quantity of a molybdic acid sol, the rate of change of specific conductivity per mole of H2T i.e \( {{dx} \over d(H_2T)}\) where \(k\) is the observed increase in specific conductivity over the sum of the specific conductivities due to the components assuming no reaction), and the corresponding value of \( {d{[H^+]} \over d(H_2T)}\) reach maximum when the two components are present in equimolecular proportion, and this may be associated with the formation of a complex containing the two components in the Same ratio as in the mixture i.e. 1 : 1. The observed increase of anionic conductivity of the mixtures as above over the sum of the components anionic conductivities, when present separately, is ascribed either to the dissolution of colloidal particles or miscelle ions initially present-, or to the formation of a mach stronger ionising complex imparting a higher concentration of the complex anions when present separately or more preferably to both of them. Enhancement of electrolytic conductivity and H-ion concentration of a tartaric acid solution on addition of molybdic acid and the evidence' associated with the formation of a complex in solution have been discussed