How Is Sodium Dithionite Sigma Synthesized?

Sodium dithionite sigma can be synthesized through the reaction of sodium bisulfite with sulfur dioxide in the presence of a reducing agent such as zinc or iron. The reaction is typically carried out in an acidic solution and involves the formation of an intermediate called sodium sulfurous acid, which subsequently decomposes to produce sodium dithionite. The resulting product is then typically purified through recrystallization from water or ethanol. Overall, the synthesis of sodium dithionite sigma requires careful control of reaction conditions and purification steps to achieve high purity and yield.