21. Write down the chemical reaction of obtaining the sol and the formula of the micelle. Draw a conclusion about the coagulating capacity of electrolytes, arrange them in order of increasing coagulation threshold.
Given solutions: Pb(NO3)2 H2SO4 (excess) core: PbSO4
Electrolyte: Zn(NO3)2; CH3COONa; Na2SO4

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