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Fertilisers

Fertilisers. Growth of Plants. To grow well plants require elements in the form of water soluble compounds; these are called NUTRIENTS. The most important Nutrients that plants require are Nitrogen, Phosphorus and Potassium (NPK)

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Fertilisers

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  1. Fertilisers

  2. Growth of Plants • To grow well plants require elements in the form of water soluble compounds; these are called NUTRIENTS. • The most important Nutrients that plants require are Nitrogen, Phosphorus and Potassium (NPK) • These Nutrients are often added in the form of FERTILISERS

  3. Nitrogen Fixing • Some plants can absorb Nitrogen directly from the air.Plants that can do this e.g.Peas, beans and clover are called Leguminous plants. They contain tiny nodules called Nitrifying Bacteria. • Most plants can’t do this and require to absorb Nitrogen in the form of Nitrogen compounds. • Nitrogen in the form of compounds is called Fixed Nitrogen

  4. The Industrial Preparation of Ammonia-The Haber Process • N2(g)+3H2(g)2NH3(g)(Ammonia) • This an example of a Reversible Reaction (a reaction that goes both ways) • To obtain the best yield of Ammonia the reaction requires a Catalyst of Fe, a Temp of 5000C and a pressure of 150-300 atms. • Starting Materials: Nitrogen is obtained by the fractional distillation of the Air and the Hydrogen is obtained from CH4 in Natural Gas

  5. Industrial Preparation of Nitric Acid-The Ostwald Process • Takes place in 3 stages; with the first one being the most difficult • 1. NH3(g) + O2(g) NO(g) + H20 • 2. NO(g) + O2(g) NO2(g) 3.. NO2 + H2O HNO3 (Nitric Acid). • An Platinum Catalyst and a temp 5000C are required to make the first stage happen. • Nitric Acid is used in the manufacture of Fertilisers, explosives and plastics.

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