306. When adding 1 ml of K2Cr2O7 solution with a concentration of 0.01 mol/l to 20 ml of alumina sol, 1 ml of a solution of K2Cr2O7 with a concentration of 0.01 mol/l is observed the beginning of a clear coagulation. Calculate the coagulation threshold (mmol per liter of sol) and the coagulation capacity of potassium dichromate with respect to the aluminum oxide sol.

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