80. Coagulation of 3⋅10-5 m3 of AgI sol is observed when 30 ml of KNO3 electrolyte with a concentration of 1 kmol/m3 is added to it. Based on the DLVO theory, determine the concentration of 10-7 m3 of electrolyte Al(NO3)3, which causes coagulation of 10-5 m3 of this sol.

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