Here in this article you will learn about the preparation, properties, uses and structure of ammonia NH3 P block elements. You can download the PDF of ammonia p block elements and watch the video for complete information

Chemistry Notes on Ammonia  NH3 P block elements


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Preparation of Ammonia NH3 P block elements

Ammonia is formed by the decomposition of nitrogenous organic matter like urea.

In the laboratory ammonia is prepared by heating mixture of slaked lime and ammonium chloride.

Ammonia is also obtained by heating ammonium salt with base which decompose when reacted with calcium hydroxide or caustic soda.

Ammonia is is manufactured on a large scale by the direct combination of Nitrogen and hydrogen gases.

If the forward reaction is exothermic and proceeds with the decreasing number of gaseous moles then apply Lechatelier’s principle. The favourable conditions for the forward process are low temperature and high pressure.

The flowchart for the production of ammonia by the Haber’s process is also given above.

Properties of Ammonia NH3 P block elements

Ammonia is a colourless gas with a pungent odour

Due to hydrogen bonding Ammonia has higher boiling point and melting point than expected for the similar molecular mass compound.

Ammonia is extremely soluble in water. Therefore its aqueous solution is mildly basic due to the release of hydroxide ions.

NH3 forms ammonium salts with acids like ammonium chloride ammonium sulphate.

Ammonia behaves as a Lewis base due to the presence of lone pair of electrons on the nitrogen atom of ammonia molecule.

NH3 forms a number of complexes with their metal ions such as copper and silver and by donating the electron pair in the vacant the orbitals of these transition metals.

Ammonia precipitate the hydroxides and hydrated oxides of many salts from their salt solutions

Structure of Ammonia NH3 P block elements

Nitrogen atom in ammonia is SP3 hybridised. Shape of ammonia molecule is trigonal pyramidal due to the presence of three bond pairs and one lone pair of electrons.

Uses of Ammonia NH3 P block elements

Liquid ammonia is used as a refrigerant.

Ammonia is used in the manufacturing of nitric acid, nitrogenous fertilisers like urea, ammonium phosphate, ammonium sulphate, ammonium nitrate.

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