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sodium dithionite melting point
The melting point of sodium dithionite is 299°C. This is slightly higher than the melting point of sulfur dioxide (S2) at 275°C. The boiling point of this substance is 205°C, whereas the evaporation temperature is 150°C.
Sodium dithionite is the disodium salt of dithionous acid and belongs to the class of inorganic compounds known as alkali metal dithionites. These are inorganic compounds that contain an oxoanion and the heaviest atom not in an oxoanion is an alkali metal.
It is used as a bleaching agent in the chemical industry and in textiles, and it is also employed as a reducing agent for dyes. It is also used in the treatment of water, as well as in gas purification and cleaning.
This substance is flammable and can ignite when exposed to high humidity or elevated temperature. It is classified as self-igniting hazardous goods (Class 4.2, UN 1384).
Inhalation of the fumes may cause respiratory tract irritation and asthma, pulmonary oedema and bronchitis. The skin and eyes may become irritated and reddened.
The gastrointestinal tract can become inflamed and can cause diarrhea, vomiting and atony. Ingestion of the powder is not toxic, but it can cause irritation to the stomach and intestines.
It is a soluble salt and is used as a reducing agent in industrial dyeing processes, where it eliminates excess pigments, residual oxides and unintended dyes. It is also used as a bleach in paper pulp, cotton, wool and kaolin clay.