7. Coagulation of 1.5*10-3 m3 of Fe(OH)3 sol is observed upon adding 60 cm3 of KCl electrolyte with mass fraction Cmas=6% and density p=1036.9 kg/m3 to it. Calculate the concentration of 10-1 cm3 of AlCl3 electrolyte that will cause coagulation of 10-5 m3 of this sol. Determine the sign of the charge of the sol particles.

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