79. Coagulation of 10-5 m3 of AgI sol is observed when 5 ml of electrolyte Ca(NO3)2 with a concentration of 0.01 kmol/m3 is added to it. Based on the DLVO theory, determine the concentration of 10-6 m3 of Al(NO3)3 electrolyte that causes coagulation of 10-5 m3 of this sol.

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