9.12. Check the applicability of Smoluchowski's theory for the coagulation of selenium sol with a solution of potassium chloride by determining the half-coagulation time θ from the following experimental data:
Coagulation time τ, s 0 65 288 595 908 1190
Total number of particles in 1 m3, n*10-15 3.22 2.52 1.33 0.98 0.67 0.53

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