Natriumthiosulfid

Natriumthiosulfid, also known as sodium thiosulfide, has the chemical formula Na2S2. It is an inorganic compound that exists as a salt. In its solid form, it typically appears as yellow crystals or powder. Natriumthiosulfid is soluble in water, forming an alkaline solution.

The compound is formed from the reaction of sodium sulfide with elemental sulfur. It is considered a polysulfide, meaning it contains sulfur-sulfur bonds. The thiosulfide anion (S2^2-) is the key structural component.

Natriumthiosulfid has found limited but notable applications. It has been used in photography as a fixative, although sodium thiosulfate (Na2S2O3) is far more common for this purpose. In some industrial processes, it may be employed as a sulfurizing agent. It can also be found as an impurity in certain industrial chemicals.

When heated, natriumthiosulfid can decompose. Its reaction with acids typically liberates hydrogen sulfide, a toxic gas. Due to the potential for hydrogen sulfide release, proper handling and storage are important. The compound is generally considered an irritant.