Organic Lab #13

Organic Lab #13 - The capillary tube was inserted into the...

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Experiment #13 Melting Point Determination Purpose The melting point of a substance is the temperature at which a given solid will melt. If the melting point is known of the pure substance, than it is possible to measure the melting point of what substance and see if it matches. If the melting point is the same, than that is a good indication that the compound is pure. If the melting point differs from the original one, then that indicates the compound is not pure. Instrument Used
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Procedure The determination of the melting point of benzoic acid began by benzoic acid being poured onto a watch glass and thoroughly crushed with a glass rod. Afterwards, the benzoic acid was inserted 3-4 mm into the capillary tube. The capillary tube was dropped through a large, clear glass tube 4-5 times, in order to allow the benzoic acid at the sealed end to pack tightly.
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Unformatted text preview: The capillary tube was inserted into the melting-point apparatus. Heat was applied at a uniform rate with voltage 2 for 10 minutes. After 10 minutes have passed, heat was increased by a rate of 2 voltages for every 3 minutes that passed. The sample must constantly be observed to make sure the melting-point range is easily discernable. Results and Conclusions The experimental melting-point range obtained was 116-122C. The literature melting-point range for benzoic acid is 118-122C. There is only a 2C difference between the lower ranges of the experimental and literature melting-point range. This slight difference may be attributed to air pockets trapped between the benzoic acid. The air may have lowered the melting point range slightly, however the higher range of the melting-point range is correct....
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This note was uploaded on 02/16/2011 for the course CHEM 263 taught by Professor St-hilarie during the Spring '11 term at CUNY City.

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Organic Lab #13 - The capillary tube was inserted into the...

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