What is the formula for thiosulfate ion?

The thiosulfate ion is represented by the formula S2O3^(2-). This indicates that the ion consists of two sulfur atoms and three oxygen atoms, with an overall charge of -2.

In thiosulfate, the presence of two sulfur atoms distinguishes it from other sulfur oxoanions. The structure reflects a specific arrangement where one of the sulfur atoms is in a lower oxidation state compared to the sulfur in sulfate (SO4^(2-)), which only has one sulfur atom, and this helps in identifying it as thiosulfate in contrast to others like sulfite (SO3^(2-)) and sulfate.

The notation with the charge indicates that this ion is a polyatomic ion, commonly found in various chemical reactions, particularly in redox chemistry and biochemistry, where it can act as a reducing agent.

Understanding the unique composition of thiosulfate allows chemists to determine its role in a reaction, where it can participate in electron transfer due to its ability to exist in multiple oxidation states. This knowledge is crucial for anyone studying chemistry, enabling them to correctly identify and work with different ions in various chemical contexts.