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Recrystallization Essay

1269 words - 5 pages

Objective:1. To determine the percent recovery from recrytalisation2. To determine the melting point of the crystals formed3. To purify a solid by recrystalisation.Apparatus:- Erlenmeyer flask- Filter paper- Short-stemmed funnel- Buchner funnelMaterial:- Benzoic acid- Charcoal- Boiling chipsProcedure:About 2.0g of crude benzoic acid was weighed into a 250mL Erlenmeyer flask.100 - 200mL of water with boiling chips were heated to boiling in a beaker on a hot plate.An Erlenmeyer flask with a little water and boiling chips in it was heated. A short-stemmed funnel was rested at its neck and a filter paper was fluted to fit the funnel.A few boiling chips were added to the benzoic acid. Hot water was added to it until the benzoic acid dissolve.The flask was kept on the hot plate once the hot water was added to keep it hot.Decolorizing charcoal was added because colored impurities were present.The hot solution was filtered through the fluted filter paper into the heated flask.The original flask and the filter paper were rinsed with a little hot water.The solution of benzoic acid was removed from the hot plate and allowed to cool.After 15 minutes, the flask was cooled in an ice bath.The crystals formed were collected by suction filtration using Buchner funnel.A wet 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 weight was taken and recorded.Observations & Results:Original weight of benzoic acid = 1.95gWeight of filter paper = 0.54gWeight of filter paper + benzoic acid crystal = 2.32gWeight of benzoic acidcompound recovered after recrystallization = 2.32 - 0.54= 1.78gweight of compound recoveredPercent Recovery = ---------------------------------------- x 100 %original weight of compound1.78g= -------- x 100 %1.95g= 91.28 %Melting point of crystal = 125oC - 126oCDiscussion:We started off the experiment by weighing 1.95g of benzoic acid which was taken as the original weight that is 1.95g in this experiment. And then, seven steps were followed in order to complete the recrystalization process and finally the weight of the recovered compound was taken which is, 1.78g, to calculate the percent recovery.The first step out of the seven steps mentioned earlier is to identify a good solvent. In this experiment, water was chosen as the solvent because benzoic acid is relatively insoluble in water at room temperature but much more soluble in water at higher temperature. This difference in solubility at hot versus cold temperatures is essential for the recrystallization process. Other than that, water is a good solvent because it does not react with benzoic acid. At the same time, water is also a good solvent for the benzoic acid impurities at both high and low temperatures.The second step is to dissolve the sample in the minimum volume of hot water to get a good yield of a saturated...

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