5. The coagulation threshold of the Al2O3 sol with negatively charged colloidal particles of potassium chloride y(KCl) is 4.2*10-2 mol/dm3. Determine the threshold for coagulation of this sol by electrolytes: a) CaCl2 b) Al(NO3)3 c) Na2SO4. Choose the most effective coagulant electrolyte from the offered salts.
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