CoCl2 is fairly soluble in water. In pure water it forms the following equilibrium at sarurated condition.
CoCl2(s) Co2+ (aq) + 2Cl- (aq)
Now , when HCl is added , it dissociates to form H+ and Cl- ion the solution . So on addition of HCl to aqueous solution of CoCl2 the concentration of product (Cl-) increases. By Le-chateliers principle with increasing concentration of product the system shifts towards left side (reactant side) thus dissociation of CoCl2 is suppressed . Hence solubility of CoCl2 decreases in presence of common ion Cl-. Such effect is called common ion effect.
So, CoCl2 is more soluble in water than in HCl solution.
I'm trying to learn acids and bases and I can't figure out CoCl2's solubility in water...
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