Respuesta :
The meting point is the temperature at which the solid state of the substance changes to the liquid state at the atmospheric pressure.
On melting, the substance may be decomposed slightly and there is a change in the structure of the substance that is on melting it goes from crystalline to amorphous structure and will not melt at the same temperature as the crystalline structure. Hence, the fresh sample must always be used for determining the melting point of the sample.
The melting point is the temperature point at which the substance changes its state. The sample should not be reused because of the contamination and sample decomposition.
What is a melting point?
The melting point of the substance or the compound is the change of the phase of the substance from the solid to the liquid phase of the matter. It is a temperature at the atmospheric pressure where the state of the matter changes.
Melting a substance changes and alters the chemical structure of the compound and are likely to undergo decomposition reactions. The reused samples will have some impurities in them that will alter the melting point of the substance when used again.
The structure of the chemical compound will alter and the m.p of the substance will get decreased. Hence, fresh samples should be taken for analysis.
Therefore, reused samples of the melting point determination should not be used.
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