106. Solving a chemistry problem
198. One of the following solutions must be added to 5 ml of Fe(OH)3 sol to start explicit coagulation: 4 ml of 3N KCl solution; 0.5 ml of 0.01 N K2SO4 solution; 3.9 ml of 0.0005 N K4[Fe(CN)6] solution. How many times the coagulating ability of K4[Fe(CN)6] is higher compared to K2SO4 and KCl.
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