4. Coagulation of 10-2 m3 of AgI sol is observed when adding 10-5 m3 of KNO3 electrolyte with a concentration of 1 kmol/m3 to it. Based on the DLVO theory, determine the concentration of 10-5 m3 of Ca(NO3)2 electrolyte that causes coagulation of 10-3 of this sol.

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