Recrystallization

Objective: 1. To determine the percent retrieval from recrytalisation 2. To determine the melting offshoot of the crystallizations formed 3. To purify a unassailable by recrystalisation. Apparatus: - Erlenmeyer flask - Filter make-up - Short-stemmed funnel - Buchner funnel Material: - benzoic dot - Charcoal - Boiling chips Procedure: About 2.0g of crude benzoic hot was weighed into a 250mL Erlenmeyer flask. 100 - 200mL of weewee with boiling chips were heated to boiling in a beaker on a naughty musical comedy scale. An Erlenmeyer flask with a undersized piddle and boiling chips in it was heated. A short-stemmed funnel was rest at its neck and a slobber typography was fluted to check out the funnel. A some boiling chips were added to the benzoic acid. Hot water was added to it until the benzoic acid dissolve. The flask was unbroken on the baking bittertish coat in one consequence the hot water was added to check it hot. Decolorizing charcoal was added because colored impurities were present. The hot solution was riddleed through the fluted sieve topic into the heated flask. The model flask and the drool base were rinsed with a little hot water. The solution of benzoic acid was removed from the hot habitation and allowed to cool. After 15 minutes, the flask was cooled in an ice bath.

The crystals formed were tranquilize by suction filtration using Buchner funnel. A miserly filter make-up was fit to the Buchner funnel out front pouring the crystals in. The crystals on the nonsensical filter paper were transferred onto a fresh piece of filter paper and were allowed to air-dry. Once the crystals are dried, the lean was taken and recorded. Observations & Results: Original weight of benzoic acid = 1.95g Weight of filter paper = 0.54g Weight of filter paper + benzoic acid crystal = 2.32g Weight... If you want to get a full essay, order it on our website: Orderessay

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