98. Solving a chemistry problem

14. How many times will the As2S3 sol coagulation threshold decrease if for coagulation of 1010-6 m3 of sol, MgCl2 and AlCl3 are used instead of NaCl  The concentration and volume of electrolyte solutions required for sol coagulation are given in the table. What is the charge of the sol particles?
Electrolyte NaCl MgCl2 AlCl3
С, kmol/m3 0.5 0.036 0.01
V *106, m3 1.2 0.4 0.1