Na3PO4 is a colorless or white crystal at room temperature. It is soluble in water. Its melting point is 340 ̊C (644 ̊F), density 1.62 g/cm3. Na3PO4 is easy to become hydrated in the open air. It will decompose into Na2HPO4 and NaOH when soluted in water. Na3PO4 has been used in medical, food and various industries, such as soften the water, improve food quality, as a detergent or treat neurodermatitis, chronic myelocytic leukemia etc.