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Watch this video on how to measure the melting point in the chemistry lab. The movie does not explain the melting point measurement of an actual substance, but shows the melting point and the state change of a virtual one. The melting point (mp) is one of the basic properties of a substance and is employed for the identification by comparing it with the reported value.
A sample having the same melting point as the authentic is mixed with the authentic, melted, and solidified by cooling. If the sample thus obtained has the same melting point as that of the original, it become reliable identification.
The melting points of pure organic substances are sharp, and the range between the beginning and the end of the melting should be within a few degrees. Those of impure substances are often broad and lower than the reported values. However, an apparent value of lower temperature is observed when the temperature is risen too fast. Be careful to rise the temperature. After measurement, wipe off softly the sample on the heating plate not to scratch its coating.
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