Recrystallization is a purification technique that aims to remove impurities from a compound. Here's how the melting point is expected to change with recrystallization:

Before Recrystallization:

* Impure compound: The presence of impurities disrupts the regular crystal lattice of the compound. This disruption lowers the melting point and creates a broader melting range.

* Melting point: The melting point will be lower than the pure compound's melting point.

* Melting range: The melting range will be wider, indicating that the solid starts to melt at a lower temperature and takes a longer time to fully melt.

After Recrystallization:

* Recrystallized compound: The impurities are removed, allowing the compound to form a more ordered crystal lattice.

* Melting point: The melting point will be closer to the pure compound's literature melting point.

* Melting range: The melting range will be narrower, indicating a sharper transition from solid to liquid.

In summary:

Recrystallization is expected to increase the melting point and narrow the melting range of an impure compound. This is because the recrystallization process removes impurities, leading to a more pure and ordered crystal structure.

Note: The extent of the change in melting point and range will depend on the nature and amount of impurities present in the original sample.