What is Dipotassium phosphate?
Dipotassium Phosphate is the dipotassium salt of phosphoric acid with the chemical formula K2HPO4. It is freely soluble in water and insoluble in ethanol. The reaction chemistry for the production of dipotassium phosphate appears as a condensation of phosphoric acid using potassium hydroxide. Phosphoric acid is in turn manufactured from phosphate rock, which is found in several places throughout the world.
Other names – Dipotassium hydrogen phosphate, Potassium phosphate dibasic
|Molecular Weight/ Molar Mass
|Hydrogen Bond Acceptor
|> 465 °C
Dipotassium Phosphate Structure – K2HPO4
Physical Properties of Dipotassium Phosphate – K2HPO4
|White powder; deliquescent
|Heavy Atom Count
|Soluble in water
Chemical Properties of Dipotassium Phosphate – K2HPO4
- Dipotassium Phosphate reacts with hydrogen chloride forms phosphoric acid and potassium chloride. The chemical equation is given below.
K2HPO4 + 2HCl → 2KCl + H3PO4
- Dipotassium Phosphate reacts with a base like sodium hydroxide forms disodium hydrogen phosphate and water.
3K2HPO4 + 2NaOH → Na2HPO4 + 2K3PO4 + 2H2O
Uses of Dipotassium Phosphate – K2HPO4
- Dipotassium phosphate is used in fertilizers, due to the highly water-soluble property it is often used because it delivers a high amount of phosphorous to the growing plants.
- Used as a food additive, but the grades are different for food versus fertilizer use.
- Used to increase the pH of milk which would increase micellar net charge.
- Used as a competitive displacement of calcium by sodium in the micelles.