To prepare pure crystals of benzoic acid from an impure sample, Mom, what is benzoic acid? Benzoic acid is a crystalline solid and has low solubility in cold water, but it is soluble in hot water. C6H5COH or benzoic acid. Let's do an experiment to prepare pure crystals of benzoic acid from an impure sample. Our aim here is to prepare pure crystals of benzoic acid from an impure sample. The materials required are 250 ml beakers, 2, funnel, glass rod, china dish, impure sample of benzoic acid, animal charcoal, procedure, take 2-3g of crude sample in 250 ml beaker and add hot water. 150 ml with constant stirring, also add 1g of charcoal to remove any colour and boil for a minute. Filter while hot and discard the residue. Cool the collected filtrate in a water bath on cooling, shining white crystals of benzoic acid are separated. Observations. Shape of crystal is equal to x colour of crystal is equal to x weight of crystal is equal to x gram. Result. The shining white crystals of benzoic acid are obtained. Precautions. Heating of organic compound is done in water bath. Thank you, Mom. For this knowledgeable experiment.