Characteristic

Ammonium dihydrogen phosphate (ADP), also known as monoammonium phosphate (MAP) is a chemical compound with the chemical formula (NH₄)(H₂PO₄). 

Chemical formula：H₆NO₄P

Molar mass：115.025 g·mol⁻¹

Appearance：white crystals

Odor：none

Density：1.80 g/cm³

Melting point：190 °C (374 °F; 463 K)

Solubility in water：(g/dL) 28 (10 °C)  36 (20 °C)  44 (30 °C)  56 (40 °C)  66 (50 °C)  81 (60 °C)  99 (70 °C)  118 (80 °C)  173 (100 °C) 

Solubility：insoluble in ethanol

                   insoluble in acetone

Refractive index (nD)：1.525

Crystal structure: tetragonal

Application

ADP is a major ingredient of agricultural fertilizers and some fire extinguishers. It also has significant uses in optics and electronics.