1. For barium sulfate sol, the coagulation thresholds with electrolytes are as follows:
g(KCl) = 256.0 mmol/l; g(K2SO4) = 3.9 mmol/l;
g(K3PO4) = 0.34 mmol/l.
Determine the sign of the charge of the granules of this sol.
Find out whether the experimental data obtained obey the pattern established by Deryagin and Landau (g ~ 1/z6).

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