Question

What effect does recrystallization expected to have on the melting point of your product? Briefly explain why.

I know that recrystillzation is a method to purify a desired product and depending how well or poor the process was done, it will affecting the melting point range. So if the recrystallization product is done well, then the melting point range will be very small indication that the desired product is near pure and vice versa. However, I can't seem to figure why that is the case. Does impurity have to do something with changing the desire product's intermolecular forces thus leading to a larger melting point range. Any opinions would be greatly appreciated Thank you!

Answer 1

recrystalliztion will increase the melting point, since crystalization is a rearrangement of solid structure.

The higher crystallization level, the higher energy we require to "break" those bonds

When we talk about the melting point test, we prefer very LOW ranges, i.e. this means the product is pretty pure

the more impurities it has, the higher range it will have.

But the important part in this test, is actually identify the crystallization structure

if you do NOT crystallized correcty, then the melting point will be much lower