13. Determine the coagulation threshold SkII of the Al2O3 sol if 50 cm3 of a K2CrO4 solution with a concentration of 0.01 kmol/m3 are required to coagulate 1000 cm3 of this sol. What will Sk1 be when a NaCl solution is added to the sol (the conditions are the same)? Determine the sign of the charge of the sol particles.

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