Why is it necessary to use a powder rather than a crystalline sample when determining melting point?

Answer 1

with a crystalline solids ,transfer of heat will not be uniform which can cause an error in the determination of the melting point of a substance .

Answer 2

Using a powder sample allows for a more accurate measurement of the melting point because it provides a more uniform surface area for heating and minimizes the effect of any impurities. In contrast, a crystalline sample may have uneven surfaces that can lead to misleading results or unreliable melting point values.

Answer 3

Finely ground particles of the compound are necessary for good heat transfer. If the particles are too coarse, they do not pack well, causing air pockets that slow heat transfer.