87. Solving a chemistry problem

87. Solving a chemistry problem

826. Rapid coagulation of 1000 ml of arsenic sulfide sol (whose charge is negative) is observed when 1.38 ml of a 0.5 mol/l ZnCl2 solution is added to it. Based on the DLVO theory, estimate the minimum concentration of the Al2(SO4)3 solution for 1 ml of its solution to have a similar effect on the same volume of the As2S3 sol.

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