PreLab1 - Harrison Salisbury Lab 1 1. a) Two useful...

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Harrison Salisbury Lab 1 1. a) Two useful functions served by knowing the melting point of an organic compound: Asses a compounds purity. As a physical constant it can be helpful in determining the identity of an unkown compound. b) Why a finely powdered sample should be used in a melting point measurement: Its essential for good heat transfer. Air pockets alter the heat transfer and are present in coarse or clumpy powder. c) why it is important to heat a sample slowly to obtain an accurate melting point. So the observer can correctly recognize the exact point at which it melts and its melting point range. Boiling it may toss the substance around before it melts as well. d) two reasons why it is sometimes difficult to measure the temperature at which the crystals first begin to liquefy. The impurity is too small. Heating the sample too rapidly, stick to 1-2 degrees because the range at which crystals first transfer is a small range and can be missed if not closely paid attention to. e) what two effects a soluble impurity usually has on the melting point of a
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PreLab1 - Harrison Salisbury Lab 1 1. a) Two useful...

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