Study Guides/Chemistry/Ammonium Nitrate Formula
Study Guide · Chemistry

Chemical Formula of Ammonium Nitrate

Ammonium Nitrate is a highly significant inorganic chemical compound. It is a white crystalline solid that is highly soluble in water and is extensively used in agriculture worldwide.

Question (Click to Flip)

Why does dissolving ammonium nitrate in water make it cold?

Answer

The process of dissolving it breaks its ionic bonds, which absorbs heat energy from the surrounding water, making it an endothermic reaction. This is how instant cold packs work.

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Key Facts

It is an endothermic compound when dissolved in water (it makes the water cold).

Improper storage of large quantities can lead to massive accidental explosions.

It is solid at room temperature.

1. The Chemical Formula

The chemical formula for Ammonium Nitrate is $NH_4NO_3$. It is an ionic salt composed of two polyatomic ions:

  • The Ammonium cation: $NH_4^+$
  • The Nitrate anion: $NO_3^-$

2. Primary Uses

  • Fertilizer: Because it contains a massive amount of Nitrogen (vital for plant growth), it is one of the most popular agricultural fertilizers in the world.
  • Explosives: When mixed with fuel oil, it creates an explosive mixture called ANFO, widely used in mining and quarrying.

Questions and Answers

Why does dissolving ammonium nitrate in water make it cold?+

The process of dissolving it breaks its ionic bonds, which absorbs heat energy from the surrounding water, making it an endothermic reaction. This is how instant cold packs work.

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