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10th Class Chapter No 14 - Study of Compouds - Ammonia in science for ICSE

Ammonia is a compound of nitrogen and hydrogen with the formula NH3.

Salts of ammonia have been known from very early times. .As early as the thirteenth century, ammonia was known to the alchemists.In 1909, Fintz Haber and Carl Bosch developed a method of producing ammonia from atmospheric nitrogen called the Haber process or the Haber-Bosch process.

  • Ammonia is a colorless gas with a pungent odour. It is a gas at standard temperature and pressure and is corrosive to some materials.
  • It is lighter than air, its density being 0.589 times that of air. It is easily liquefied; the liquid boils at -33.3 °C and solidifies at -77.7 °C to a mass of white crystals.Ammonia quickly dissolves in water. It does not burn readily unless mixed with oxygen.
  • Ammonia occurs in small quantities in the atmosphere, in rainwater, in fertile soil and sea water. It exists naturally in humans.The kidneys excrete ammonium ions (NH4+) to neutralize excess acid.
  • Ammonia is essential for many biological processes and serves as a precursor for amino acid and nucleotide synthesis.
  • In the environment, ammonia is part of the nitrogen cycle and is produced in soil from bacterial processes. Ammonia is also produced naturally from decomposition of organic matter, including plants, animals, and animal wastes.

 

Ammonia has molecular formula NH3 and molecular mass of 17.  It occurs in a free state in air and traces of water. In combined state, it occurs in ammonium chloride, ammonium sulphate etc.

Ammonia or azane is a compound of nitrogen and hydrogen. It is a gas at room temperature and has a sharp, pungent odour. A solution of ammonia is alkaline and commonly used in the kitchen as a cleansing agent because it has an ability to dissolve grease. Most of the ammonia manufactured is converted into fertilizers like ammonium nitrate or ammonium sulfate. These provide nitrogen to the soil
Posted in 10th on July 15 2020 at 04:12 PM

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