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The changes in pH and electrical conductivity of ferric tellurate, chromium tellurate and aluminium tellurate sols during their slow coagulation in the presence of KCl, K 2 SO 4  and K 3 Fe(CN) 6  have been studied in comparison with that of the aqueous solutions of ferric chloride, chromium chloride and aluminium chloride acting as the dispersion medium (the socalled intermicellar liquid), being of the same conductance as that of the respective sol. On adding the electrolyte, the maximum changes in conductance and pH have been observed to occur immediately indicating that the phenomena like ion-exchange, adsorption or surface neutralisation during the slow coagulation are instantaneous processes.

Studies on the changes in electrical conductivity and pH during slow coagulation of ferric, chromium and aluminium tellurate sols by electrolytes