Disodium Phosphate (HNa2O4P) is a sodium salt of phosphoric acid. It is a white powder that is highly hygroscopic and water soluble. It is therefore used commercially as an anti-caking additive in powdered products. It is commercially available in both the hydrated and anhydrous forms.

Disodium Phosphate can be used in cream of wheat to quicken cook time, as described on the ingredients panel of the product package.

It is used in conjunction with trisodium phosphate in many steam boiler applications. It supplies the inventory of free phosphates to retard calcium scale formation.

It is used as a saline laxative to treat constipation or to clean the bowel before a colonoscopy.