54. For coagulation of 100 ml of iron hydroxide sol, it was necessary to add the following amounts of each of the electrolytes: 10.5 ml of 1N. KCl solution; 62.5 ml 0.01n. Na2SO4 solution and 37 ml of 0.001N. Na3PO4 solution. Determine the sign of the sol charge and the coagulation thresholds.
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