Recrystallization

Objective: 1. To determine the percent recovery from recrytalisation 2. To determine the thawing leg of the crystals formed 3. To purify a solid by recrystalisation. Apparatus: - Erlenmeyer flaskful - Filter make-up - Short-stemmed funnel - Buchner funnel Material: - benzoic dot - Charcoal - Boiling chips surgical operation: About 2.0g of crude benzoic acid was weighed into a 250mL Erlenmeyer flask. light speed - 200mL of peeing with boiling chips were heated to boiling in a beaker on a naughty musical scale. An Erlenmeyer flask with a little piddle and boiling chips in it was heated. A short-stemmed funnel was rested at its neck and a slobber raise of music was fluted to fit the funnel. A some boiling chips were added to the benzoic acid. toothsome water was added to it until the benzoic acid dissolve. The flask was kept on the calorifictish plate in one case the hot water was added to keep it hot. Decolorizing charcoal was added because colored impuritie s were present. The hot outcome was interpenetrateed through the fluted filter paper into the heated flask. The archetype flask and the filter paper were rinsed with a little hot water. The outcome of benzoic acid was removed from the hot plate and allowed to cool. subsequently 15 minutes, the flask was cooled in an ice bath.

The crystals formed were imperturbable by suction filtration using Buchner funnel. A miserly filter paper was fit to the Buchner funnel before pouring the crystals in. The crystals on the wet filter paper were transferred onto a fresh piece of filter paper and were allowed to air-dry. Once the crystals are dried, the angle was taken and recorded. Obs ervations & Results: Original weight of ! benzoic acid = 1.95g lading of filter paper = 0.54g Weight of filter paper + benzoic acid crystal = 2.32g Weight... If you want to get a full(a) essay, order it on our website: OrderEssay.net

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