Why do you need to acidify to the reaction mixture before crystallization?

Acidifying the reaction mixture before crystallization helps to protonate any basic impurities, which can improve the purity of the desired product. It also promotes the formation of the desired crystalline form by altering solubility properties, ensuring that the product precipitates out of solution effectively. Additionally, acidification can shift the equilibrium of certain reactions, facilitating the isolation of the target compound. Overall, this step enhances the efficiency and yield of the crystallization process.