28. To study the phenomenon of coagulation, Fe(OH)3 sol and 0.01 N K2SO4 solution were taken. Electrolyte solution with melted water in the ratio of 1:1, 1:2, 1:4, 1:6 1:7 1:8 1:15. 10 cm3 of sol were measured out in seven test tubes and 5 cm3 of the corresponding diluted K2SO4 solution were added, shaken and left to stand. Calculate the coagulation threshold for K2SO4 in g-eq/l using the data:
Dilutions 1:1, 1:2, 1:4, 1:6 1:7 1:8 1:15
Coagulation precipitate precipitate precipitate precipitate turbidity - -

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