Di Ammonium Hydrogen Phosphate

Di Ammonium Hydrogen Phosphate, also known as diammonium phosphate (DAP), is an inorganic compound with the chemical formula (NH4)2HPO4. It appears as a white crystalline solid or powder that is odorless with a slightly saline taste. DAP is highly soluble in water (about 690 g/L at 20 °C) and forms a mildly alkaline solution with a pH around 7.6 - 8.4 in aqueous solutions.

Key physical and chemical properties:

Chemical formula: (NH4)2HPO4

Molecular weight: 132.06 g/mol

Appearance: White crystals or powder

Solubility: Highly soluble in water

pH of 1% solution: About 7.6 to 8.2

Melting point: Approximately 155 °C

Density: Approximately 1.62 g/cm³

DAP is widely used as a fertilizer providing both nitrogen and phosphorus essential for plant growth. It also finds use as a food additive for pH control and preservation, and in fire retardants and ceramic manufacturing due to its thermal stability. It acts as a buffering agent and is non-hygroscopic, facilitating convenient storage and transport.

Safety aspects include handling as an irritant, with proper PPE recommended, and storage in a cool, dry place in sealed containers. It is non-flammable and stable under normal conditions.

Summary:

Chemical formula: (NH4)2HPO4

White crystalline solid, odorless

Highly water soluble, slightly alkaline

Applications: Fertilizer, food additive, fire retardant, ceramics

Stable, non-hygroscopic, non-flammable

Di Ammonium Hydrogen Phosphate is a versatile compound key in agriculture, food industry, and industrial applications.​