recrystallised

Recrystallised is a term used to describe a substance that has undergone the process of recrystallization. Recrystallization is a common technique used in chemistry and materials science to purify solids. It involves dissolving an impure solid in a hot solvent in which it is soluble. As the solution cools, the solubility of the solid decreases, causing it to crystallize out of the solution in a purer form. Impurities, if present in smaller quantities and more soluble, tend to remain dissolved in the solvent.

The process of recrystallisation relies on the difference in solubility of the desired compound and the impurities at different temperatures. Careful selection of the solvent is crucial for successful recrystallization. The ideal solvent should dissolve the compound well when hot but poorly when cold, and it should dissolve the impurities either very well or very poorly at all temperatures. After the solid has crystallized, it is typically separated from the solvent by filtration. The resulting crystals are then dried to remove any residual solvent. This purified, recrystallised material is often visually different from the original impure substance, appearing as distinct crystals with a higher degree of purity. The term recrystallised signifies that this purification step has been successfully completed.