Answer:
The procedure for obtaining an organic solid in pure crystalline form involves several steps:Solubility Test: The solubility of the organic solid is tested in different solvents to find the best solvent for recrystallization.Dissolving the Solid: The organic solid is dissolved in the chosen solvent by heating it to boiling point with stirring. If necessary, the solvent can be filtered to remove impurities.Filtering the Solution: The hot solution is then filtered to remove any insoluble impurities or undissolved solid particles.Cooling the Solution: The hot filtrate is allowed to cool slowly to room temperature. As the solution cools, the solubility of the organic compound decreases, and it starts to crystallize out.Collecting the Crystals: Once the crystallization is complete, the crystals are collected by filtration.Washing the Crystals: The crystals are washed with a small amount of cold solvent to remove any adhering impurities.Drying the Crystals: The purified crystals are then dried in a vacuum oven or under reduced pressure to remove any remaining solvent.The final product obtained is a pure, crystalline form of the organic solid. The purity of the product can be verified using techniques such as melting point determination or thin-layer chromatography.: