hydrosulfurous

Hydrosulfurous acid is a chemical compound with the formula H2S2O3. It is a weak acid and a sulfur oxoacid. In its pure form, it is a colorless liquid, but it can appear yellowish due to impurities. Hydrosulfurous acid is primarily used as a reducing agent in chemical synthesis. It is also used in the production of certain dyes and in the treatment of wastewater. The acid is typically prepared by the reaction of sulfur dioxide with water in the presence of a catalyst. It is important to handle hydrosulfurous acid with care, as it can cause skin and eye irritation. It is also toxic if ingested or inhaled. The acid can be stored and transported in its pure form, but it is often sold as a solution in water.