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Sodium bisulfite is a chemical compound with the formula NaHSO3. It is the sodium salt of bisulfite ion. Sodium bisulfite is a white crystalline solid that is soluble in water. It is often encountered as a solution in water. Its chemical properties include acting as a reducing agent. This means it can donate electrons to other substances in a chemical reaction.

Industrially, sodium bisulfite has numerous applications. It is used as a disinfectant and a preservative, particularly in food and beverage industries, where it helps prevent spoilage and oxidation. It is also employed in the photographic industry as a component of developing solutions. Furthermore, sodium bisulfite finds use in the textile industry for bleaching and in the pulp and paper industry for delignification. In water treatment, it can be used to remove chlorine.

The production of sodium bisulfite typically involves the reaction of sulfur dioxide with a solution of sodium hydroxide or sodium carbonate. It is important to handle sodium bisulfite with care due to its reactive nature and potential to irritate skin and eyes. When dissolved in water, it can release sulfur dioxide gas, which has a pungent odor and can be harmful if inhaled in high concentrations.