Sodium Bisulfite

Sodium bisulfite is a white crystalline powder with the chemical formula NaHSO3. It is also known as sodium hydrogen sulfite and is commonly used as a food preservative, antioxidant, and reducing agent in various industries.

Sodium bisulfite is soluble in water and forms an acidic solution due to the presence of bisulfite ion (HSO3-). It reacts with strong oxidizing agents, such as chlorine or hydrogen peroxide, to release sulfur dioxide gas (SO2). The reaction with chlorine is often used for water treatment to remove residual chlorine, while the reaction with hydrogen peroxide is used for pulp and paper bleaching.

Sodium bisulfite can also be used to convert aldehydes and ketones into their corresponding alcohols through a process called "sodium bisulfite addition". This reaction is commonly used in organic synthesis and analytical chemistry.

However, it is important to note that sodium bisulfite can cause skin irritation, respiratory problems, and other health issues if not handled properly. It should be used with caution and appropriate safety measures should be taken when handling this compound.