On Colloidal Electrolytes. An Attempt to Account for the Effect of Dilution on their Osmatic Pressure, Conductivity and Counter Ion Activity

Department of Chemistry, University College of Science, Calcutta-9

Received 24 June 1971  accepted for publication 9 February 1972

Tartrate complex of cadmium(II) has been studied by pH titration and conductometric measurement methods. At comparatively lower pH the reaction between cadmium ion and tartaric acid results in the formation of a neutral complex C with the liberation of two protons. With increasing pH the neutral complex C undergoes stepwise dissociation resulting in the for.nation of anionic complexes C1 - and C 2 2-, The equilibrium constant values of the reactions Cd²⁺ + H₂T \(\rightleftharpoons\)  C + 2^H+, C \(\rightleftharpoons\) C₁^- + H₊, C₁^- \(\rightleftharpoons\)  C₂² + H⁺, Cd²⁺ + HT^-  \(\rightleftharpoons\)  C + H⁺, and Cd²⁺ + T^2- \(\rightleftharpoons\)  C are calculated and found to be 6.46 X I0^-6 , 2.59 x 10^-o, 5.23 x 10^-11, 3.80 x 10^-2 and 73.2 respectively.