85. Solving a chemistry problem
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85. Solving a chemistry problem
808. Rapid coagulation of 25 ml of gold sol (whose charge is negative) is observed when 1.26 ml of a 0.5 mol/l NaCl solution is added to it. Based on the DLVO theory, estimate what the minimum concentration of Na2SO4 solution should be in order for 2 ml of its solution to have a similar effect on the same volume of Au sol.
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