A Crystal can be defined as regular shaped solid formed when a

saturated solution is allowed to cool or evaporate at room

temperature.

Crystals contain water molecule attached to the compound. e.g. CUSO₄:5 H₂O

Crystallization is the process of separating salt mixtures from

their solutions through formation of crystals.

 When solutions of two or more solutes are cooled, the one with the lowest solubility crystallizes first, while the most soluble remains in solution.

To obtain a large crystal, the saturated solution is covered

with a perforated filter paper and allowed to stand (undisturbed) for 2-3 weeks.