21. Solving a chemistry problem

2. Write the reaction equation for the formation of CaSO4 hydrosol from CaCl2 and H2SO4. Write the formula of the micelle of the resulting hydrosol, provided that CaCl2 is taken in excess. Indicate the sign of the charge of the colloidal particle. Specify the coagulating electrolyte that has a lower coagulation threshold: ZnCl2, AlCl3, K2SO4.