How do you purify ester?

To purify an ester, one common method is through recrystallization or distillation. If the ester is a solid, dissolve it in a suitable solvent at a high temperature and then allow it to cool slowly, enabling pure crystals to form. For liquid esters, fractional distillation can effectively separate them from impurities based on differences in boiling points. Additionally, washing with water or an aqueous solution can help remove polar impurities.