Solubility The amount of a substance that dissolves in a given quantity of a solvent at a given temperature to form a saturated solution.

Any ions already present in solution will influence the solubility of an ionic substance that contains ions in common with those present in
solution – this is called the common ion effect. For instance if there are two solutions 0.15M NaCl and 0.05M NaCl and we are
trying to dissolve MgCl₂ in these solutions then it will be the 0.05M NaCl solution that will have the highest solubility for MgCl₂.