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Conductometric and electrometric studies of the mixed solutions of aluminium sulphate and sodium lactate reveal the existence of two compound at (1 : 2) and (1 : 3) molecular ratios. (1 : 3) compound was isolated in a pure state. The composition was established by estimating aluminium and lactic acid present in the compound.

Conductometric and pH studies of the mixed solutions of Cobalt nitrate and sodium mandelate reveal the existence of three complexes in the ratios of (1:1), (1:2) and (1:3). Two compounds having ratios (1:2) and (1:3) were isolated in pure state and their constitutions established by estimation of Cobalt and mandelic acid contents. pH titration of isolated compound (1:3) with alkali consumes four equivalents of alkali which indicates that an anionic type of compound is formed.

Conductometric, colorimetric and pH observations of the mixed solutions of uranyl acetate and pyrocatechol revealed the existence of two complexes at (1 : 1) and (1 : 2) molecular ratios. (1 : 1) compound has been isolated and its uranium and pyrocatechol contents estimated.