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Ammonium Phosphate Formula

Last updated date: 09th Apr 2024
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What is the Formula of Ammonium Phosphate?

The chemical formula of ammonium phosphate is (NH4)3PO4 and is an unstable compound made up of ammonium and phosphate salt. Ammonium phosphate is made by melting ammonium phosphate and urea together in a molten state. The ammonium phosphate sulphate is transformed to a molten state by generating a lot of heat. Monoammonium phosphates and diammonium phosphates, as well as mixes of the two and combinations with ammonium nitrate or ammonium sulphate, make up this group of nitrogen phosphorus compounds. Other names of ammonium phosphate are triammonium phosphate and diazonium hydrogen phosphate.

This article will study formulas for ammonium phosphate and an ammonium phosphide formula in detail.

Properties of Ammonium Phosphate 


Molecular formula of ammonium phosphate


1.619 g/cubic cm

Molecular Weight/ Molar Mass

149.09 g/mol

Boiling Point


Melting Point

155 °C (311 °F; 428 K) decomposes

Chemical Formula


Structure of Ammonium Phosphate Formula

As we already studied the formula for ammonium phosphate, given below is the structure of ammonium phosphate.

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Physical properties of Ammonium Phosphate 

  1. Ammonium phosphate appears to be white and tetrahedral crystals and has an ammonia odour.

  2. It shows complexity of 46.5.

  3. It consists of three covalently bonded units.

  4. Ammonium phosphate is readily soluble in water. Its solubility pH lies between 4 to 4.5.

Reactions of Ammonium Phosphate

  1. The decomposition of ammonium phosphate produces highly hazardous vapours. It produces ammonia and phosphoric acid.

(NH4)3PO4 → 3NH3 + H3PO4

  1. Lead phosphate and ammonium nitrate are formed when ammonium phosphate interacts with lead nitrate.

4(NH4)3PO4 + 3Pb(NO3)4 → Pb3(PO4)4 + 12NH4NO3

Uses of Ammonium Phosphate

  1. Ammonium phosphate is a general term for a range of nitrogen and phosphate-containing fertiliser products.

  2. As a source of accessible P2O5, ammonium phosphates are becoming more essential. Ammonium phosphates have a somewhat higher P2O5 content than triple superphosphate.

  3. It is most commonly used as a solid fertiliser, but it can also be used in a solution.

  4. They're found in intumescent paints and mastics, where they work as acid catalysts.

  5. Pentaerythritol is the carbonific component, whereas melamine is the particular chemical in paints.

Diammonium Phosphate

When ammonia combines with phosphoric acid, diammonium phosphate (DAP; IUPAC name diammonium hydrogen phosphate; chemical formula (NH4)2(HPO4) is one of a variety of water-soluble ammonium phosphate salts that can be generated. The dissociation pressure of ammonia in solid diammonium phosphate is given by the following expression and equation:

(NH4)2HPO4(s) ⇌ NH3(g) + (NH4)H2PO4(s)

DAP Structure 

As we already studied the diammonium phosphate formula, given below is the structure of diammonium phosphate.

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DAP Uses 

DAP is used as a  fertiliser. When used as plant food, it briefly raises the pH of the soil, but over time, due to nitrification of the ammonium, the treated soil becomes more acidic than before. Because its ammonium ion is more prone to change to ammonia in a high-pH environment, it is incompatible with alkaline substances. The pH of the fluid is 7.5–8 on average.


The molecular formula of ammonium phosphate is (NH4)3PO4  and is an unstable compound made up of ammonium and phosphate salt. Melting ammonium phosphate and urea together in a molten state produces ammonium phosphate. By creating a lot of heat, the ammonium phosphate sulphate is changed into a molten state. This group of nitrogen phosphorus compounds includes monoammonium phosphates and diammonium phosphates, as well as mixtures of the two and combinations with ammonium nitrate or ammonium sulphate. Triammonium phosphate and diazonium hydrogen phosphate are two other names for ammonium phosphate.

FAQs on Ammonium Phosphate Formula

1. What is The Chemical Formula of Ammonium Phosphate? What Is The Purpose of Ammonium Phosphate in Food?

Ans: The chemical formula of ammonium phosphate is (NH4)3PO4. Ammonia compounds, for example, are frequently found in chocolate products, while ammonium phosphate is commonly employed as a leavening ingredient in baking. When ammonium phosphate is used in baking, however, the heat from the oven causes the gas to evaporate, resulting in no ammonia remaining in the final product.

2. Is Ammonium Phosphate A Naturally Occurring Substance?

Ans: Commercial or synthetic fertilisers, such as ammonium sulphate or ammonium phosphate, are sometimes referred to as such since they are manufactured rather than coming from naturally occurring mineral resources.

3. Is Ammonium Phosphate a Weak Base?

Ans: Ammonia, nitrogen oxides, and phosphorus oxides are among the hazardous and corrosive gases produced. The water solution is a weak base. Strong acids and strong oxidants cause it to react violently. When exposed to air, it gradually releases ammonia.