Question

Solubility when partially soluble impurity added to water

Answer 1

water is a component in which any foreign material can dissolve

Answer 2

However, different types of impurity can have different effects, some can increase solubility but others can decrease solubility. For this reason if the source, grade or purity of the solute or solvent is changed in any way, the solubility and/or stability of the solute will need re-assessing.