136. Solving a chemistry problem

Calculate the concentrations of electrolytes that caused coagulation of 10.0 ml of arsenic sulfide sol As2S3 if, when the following volumes of electrolyte solutions (V) are added, their coagulation threshold y is as follows:
Electrolyte KNO3 Mg(NO3)2 Al(NO3)3
V, ml 12.5 0.9 0.8
y, mol/l 5.0 0.09 0.008
Determine the sign of the charge of the colloidal particle. Write the micelle formula of arsenic sulfide sol As2S3 obtained by passing hydrogen sulfide through a dilute solution of arsenic oxide As2O3.