24 For the coagulation of hydrosol hydrate of iron oxide, 10 ml of sol was added in the first case to 1.15 ml of 1N KC1, in the second - 6.25 ml of 0.01 N Na2S04 and in the third case - 3.7 ml of 0.001 n Na3PO4. Determine the sign of the charge of the sol and calculate the coagulation threshold for each electrolyte.
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