Potassium tetrathionate, K₂S₄O₆

The Potassium tetrathionate, K₂S₄O₆ is formed by the interaction of potassium thiosulphate in aqueous solution and iodine, the salt being precipitated from the reaction-mixture by addition of alcohol. It is crystalline, and has a density of 2.296. The heat of formation from the elements is 397.21 Cal.