Product name:Ammonium dihydrogen phosphate
Synonym:Ammonium dihydrogen phosphate;ammonium dihydrogenphosphate;azanium,dihydrogen phosphate
CAS:7722-76-1
Molecular Formula:H6NO4P
Formula Weight:115.03
Density:1.02 g/mL at 20 °C
Boiling point:158ºC at 760 mmHg
Melting point:190 °C (dec.)(lit.)
Refractive index:1.4768
Water solubility:368 g/L (20 ºC)
Appearance:White crystalline powder
Description:Ammonium dihydrogen phosphate (ADP), or monoammonium phosphate, NH4H2PO4, is formed when a solution of phosphoric acid is added to ammonia until the solution is distinctly acidic. It crystallizes in quadratic prisms. Monoammonium phosphate is often used in the blending of dry agricultural fertilizers. It supplies soil with the elements nitrogen and phosphorus in a form which is usable by plants. The compound is also a component of the ABC powder in some dry chemical fire extinguishers. This substance is also supplied in a jade green or aquamarine crystal growing box kit for kids.
ADP is a widely used crystal in the field of optics due to its birefringence properties. As a result of its tetragonal crystal structure, this material has negative uniaxial optical symmetry with typical refractive indices no=1.522 an ne=1.478 at optical wavelengths.