Na2S4O66H2O

Na2S4O66H2O, also known as sodium tetrathionate decahydrate, is a chemical compound that is a salt of tetrathionic acid. The formula indicates that it is composed of sodium cations (Na+) and tetrathionate anions (S4O6^2-), with ten water molecules of hydration. This compound typically appears as white crystalline solid. It is soluble in water, forming an aqueous solution.

Sodium tetrathionate decahydrate is generally considered a stable compound under normal conditions. However, like many hydrates, it can effloresce, meaning it may lose its water of crystallization when exposed to dry air. The tetrathionate anion itself is an oxyanion of sulfur, containing a chain of four sulfur atoms.

This compound has found some limited applications in various fields. Historically, it has been investigated for its potential uses in photography and as a component in certain chemical reactions. Its properties are largely dictated by the nature of the tetrathionate ion and its interaction with water molecules in the hydrated structure. Research into its specific chemical behavior and potential uses continues to be an area of interest for chemists.