A M Trivedi
Articles written in Proceedings – Section A
Volume 49 Issue 3 March 1959 pp 151-157
In the case of silica sols prepared by peptizing silica gel with ammonia, ammonium silicate is the stabilizing electrolyte. When the sols are allowed to age, the specific conductivity of the sol increases due to the deadsorption of ammonium silicate. Although ammonium silicate is a salt of a weak base and a very weak acid, it is not completely hydrolysed under the conditions of the experiments. The adsorbed ammonium silicate behaves as a colloidal electrolyte and its equivalent conductivity is a fraction of its value in the free condition.