Question

Explain why the melting point is difficult to measure.

Answer 1

Answer:

as the temperature of the liquid after melting a solid is same and so it is difficult to measure a melting point

Answer 2

It is difficult to measure the melting point

Explanation:

• Sometimes the solvent may show as droplets on the outside surface (“sweating”) which could be mistaken for melting. Another difficulty is that some compounds decompose at or close to their melting point which can make it hard to determine melting.
• The melting point of a substance is the temperature at which the material  changes from a solid to a liquid state. Pure crystalline substances have a clear, sharply defined melting point.
• During the melting process, all of the energy added to a substance is consumed as heat of fusion, and the temperature remains  constant.  A pure substance melts at a precisely defined temperature, characteristic of  every crystalline substance and dependent only on pressure (though the  pressure dependency is generally considered insignificant).

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