124. Задачка по химии №012 476

99. Three test tubes are filled with 5 ml of CdS sol obtained by reacting solutions of K2S and CdCl2. Coagulation of the sol occurred after adding 1.06 ml of 0.5 mol/l KNO3 to the first test tube, 0.8 ml of 0.02 mol/l K2SO4 to the second, and 0.5 ml of 0.003 mol/l K3PO4 to the third. Calculate the coagulation thresholds of electrolytes and determine the sign of the sol charge. Write the micelle formula of the initial sol and the change in the micelle structure during coagulation
Answer: Sk (KCl) - 180 mmol/l;
Sk (K2SO4) = 2.76 mmol/l; Sc(K3PO4) = 0.27 mmol/l
1. What is coagulation?
2. Which of the ions of the added electrolyte causes coagulation?

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