Acid inorganic ti o wọpọ, phosphoric acid ko rọrun lati ṣe iyipada, ko rọrun lati decompose, fere ko si oxidation, pẹlu acid commonness, jẹ acid alailagbara ternary, acidity rẹ jẹ alailagbara ju hydrochloric acid, sulfuric acid, nitric acid, ṣugbọn lagbara ju acetic. acid, boric acid, bbl Phosphoric acid ti wa ni irọrun deliquified ninu afẹfẹ, ati ooru yoo padanu omi lati gba pyrophosphoric acid, ati lẹhinna padanu omi siwaju sii lati gba metaphosphate.