3. To coagulate 0.05 l of arsenic sulfide sol, you can add one of the following electrolyte solutions: 0.005 l of 2N. NaCl; 0.005 l 0.03 n. Na2S04; 0.04 l 0.0005 n. Na4[Fe(CN)6]. Which of the following electrolytes has the lowest coagulation threshold; lowest coagulating ability of ions?
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