Ammonium dihydrogen phosphate (ADP) is the ammonium salt of phosphoric acid (molar ratio 1:1). It is used as a fertilizer. It contains dihydrogen phosphate. It is also known as monoammonium phosphate (MAP). ADP is a key component in agricultural fertilizers as well as several fire extinguishers.
It is also used extensively in optics and electronics.
| Compound Name | Ammonium dihydrogen phosphate |
| Sulfurous acid formula | (NH4)H2PO4 |
| Color/Form | White, tetrahedral crystals |
| Density | 1.80 g/cu cm |
| Molecular Weight | 115.03 g/mol |
Table of Contents
Ammonium dihydrogen phosphate- Key Points
- Decomposes to ammonia and phosphoric acid when heated.
- pH of 0.2 Molar aq soln: 4.2
- slightly soluble in alcohol; practically insoluble in acetone
- Stable in air
- Used in dry chemical fire extinguishers
Preparation
Ammonium dihydrogen phosphate (ADP) is manufactured industrially by the exothermic reaction of phosphoric acid and ammonia in the following proportions:
NH3 + H3PO4 → NH6PO4
Crystalline ADP then precipitates.
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PhD Student at University College Dublin and Author at What's Insight
PhD Student who loves to write about science, technology and more. Studying at the University College in Dublin. Hope you enjoy my content.
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