What methods can you use to determine the purity of a substance?

Question

In chemistry, after you separate substance, how can you determine the purity of those recovered components?

Answer 1

simply determine the melting point (if the extracted substance is a solid crystal) or the boiling point (if the substance is a liquid); then compare those data with the theoretical values (these can be found in any chemical MSDS). If your melting point or boiling point does not match any of the standards then you solution contain impurities.