127. Three flasks are filled with 0.1 l of iron hydroxide sol. In order to cause coagulation of the sol, it was necessary to add 0.01 l of 1 N NH4Cl to the first flask, and 0.06 l of 0.01 N Na2SO4 to the other, and 0.037 l of 0.001 N Na3PO4 to the third. Calculate the coagulation threshold for each electrolyte and determine the sign of the particle charge.

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