Na2CO3, or sodium carbonate, is effective in removing impurities by acting as a base to neutralize excess acids, including HBr. The discussion highlights that SO2, an acid anhydride, can react with basic solutions, indicating its role in the purification process. Bromine, noted as a strong oxidizing agent, can oxidize sulfite in alkaline conditions, leading to more stable products. The conversation emphasizes the importance of understanding the reaction conditions, particularly the separation from acids during the purification of distilled products. Overall, sodium carbonate's role as a base is crucial in this chemical context.
