CAS Registry Number

CAS 13721-29-4 — Sodium tetrathionate dihydrate

Sodium tetrathionate dihydrate is an inorganic compound primarily used in analytical chemistry as a mild oxidizing agent, particularly in iodometric titrations and redox reactions. It also serves in photography and as a reagent for sulfur analysis. This chemical has a CAS number of 13721-29-4, with the molecular formula NaO₃SS₂SO₃Na·2H₂O and a molecular weight of 306.27 g/mol. Store at 2–8°C, and handle with caution—it carries a **Warning** signal word. Molekula supplies sodium tetrathionate dihydrate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.