Ammonium dihydrogen phosphate 98 +%, pure

What is Ammonium Dihydrogen Phosphate?

Ammonium dihydrogen phosphate or monoammonium phosphate (MAP), NH4H2PO4, is one of the water-soluble salts of ammonium phosphate that can be produced when ammonia reacts with phosphoric acid until the solution is clearly acidic. It crystallizes in tetragonal prisms. Monoammonium phosphate is widely used in agricultural fertilizer mixtures. It provides the soil with the nutrients nitrogen and phosphorus in a form that can be used by plants. The compound is also a component of ABC powder in some fire extinguishers (ABC dry chemical).

What is Ammonium Dihydrogen Phosphate used for?

In addition to its primary use as an NP fertilizer, monoammonium phosphate has other applications. MAP is a crystal widely used in the field of optics for its birefringence properties. As a result of its tetragonal crystalline structure, this material has negative uniaxial optical symmetry with typical refractive indices of no = 1.522 and ne = 1.478 at optical wavelengths.

These MAP crystals are piezoelectric, a property exploited by sonar with an electroacoustic transducer and the alternative to magnetostrictive transducers. Monoammonium phosphate crystals have largely replaced those of SiO2, quartz (because they are easier to process) and Rochelle salt (sodium potassium tartrate, KOOC-CHOH-CHOH-COONa) in the mid-1950s as they are non-liquefiable.

It can often be found in chemical experiment kits to demonstrate crystal growth. The substance is not classified as a hazardous substance.

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Technical data

Ammonium biphosphate, Ammoniumphosphate monobasic
Empirical formula (NH4)H2PO4
Molar mass (M) 115.03 g/mol
Density (D) 1.8 g/cm³
Melting point (mp) 190°C
WCK 1
CAS no. [7722-76-1]
EC-No. 231-764-5