IUPAC Name: OrthoPhosphoric acid
Description : A weak acid with the chemical formula H3PO4 is phosphoric acid (also referred as orthophosphoric acid or phosphoric(V) acid). Orthophosphoric acid relates to phosphoric acid, which for this compound is the name of IUPAC. The ortho-prefix, called polyphosphoric acids, is used to distinguish the acid from related phosphoric acids. Orthophosphoric acid is a non-toxic acid, which, when pure, is a solid at room temperature and pressure.