817. Rapid coagulation of 50 ml of iron hydroxide sol (whose charge is positive) is observed when 1.55 ml of a 0.4 mol/l KNO3 solution is added to it. Based on the DLVO theory, estimate the minimum concentration of a K2SO4 solution for 1 ml of its solution to have a similar effect on the same volume of Fe(OH)3 sol.
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