8.9.2 Precipitation of colloids by electrolytes cO-Ions Precipitating values for As,s, colloids As2S3(-) Electrolytes KNO Electrolytes Precipitating value K,SO4 Mgcl 0.72 Precipitating values 50 32.7 MgSO 0.81 When counterion is the same, the higher the valence of the co-ions the higher the precipitating value(4) co-ions When counterion is the same, the higher the valence of the co-ions, the higher the precipitating value. Electrolytes KNO3 K2SO4 Precipitating values 50 32.7 Precipitating values for As2S3 colloids As2S3 (−) Electrolytes Precipitating value MgCl2 0.72 MgSO4 0.81 8.9.2 Precipitation of colloids by electrolytes