Hypophosphoric acid is a mineral acid with phosphorus in the form of +4 oxidation state. It contains the chemical formula H4P2O6. In solid state, it exists as a dihydrate, H4P2O6.2H2O. It can be made by reacting with red phosphorus and sodium chlorite at room temperature. In this article, let us discuss the formula of hypophosphoric acid and its chemical structure, properties, and uses.