2. Cadmium sulfide sol was obtained by mixing equal volumes of Na2S and Cd(NO3)2 solutions. The coagulation thresholds for various electrolytes are as follows (mol/dm-3): Cp(Cd(NO3)2) = 265; Cp(NaCl) = 250; Cp (MgCl2) = 290; Cp (Na3PO4) = 0.4; Cp (Na2SO4) = 15; Cp(AlCl3) = 300. What is the sign of the charge of the sol particles and which of the electrolytes is taken in excess?

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