Potassium Iodate is an oxidizing agent and a good primary standard with the one drawback of having a relatively low equivalent weight. It is used primarily as a stable source of Iodine, which is liberated in the presence of Iodide ion and acid, in the titration of Thiosulfate and Sulfite solutions. The Iodide can be included in the Iodate solution or added before the acid is added and titration is begun. In this series of reactions, the equivalent weight of Potassium Iodate is one-sixth the molecular weight. RICCA CHEMICAL COMPANY Potassium Iodate and Potassium Iodate-Iodide titrants are intended for use in weakly acidic medium, and the normalities are calculated on this basis.