GCSE Chemistry Revision — Fertilisers & Haber Process
Revise Fertilisers & Haber Process for GCSE Chemistry with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What is Fertilisers & Haber Process?
Fertilisers are substances added to soil to replace essential elements used by plants as they grow. NPK fertilisers contain the three main essential elements: Nitrogen, Phosphorus, and Potassium. The nitrogen for fertilisers is obtained from ammonia, which is produced by the Haber process.
Board notes: The Haber process is a key industrial process and a major case study for reversible reactions and Le Chatelier's principle. It is a higher-tier topic for all boards. You must know the conditions for the process and be able to explain why they are chosen. The use of ammonia to produce fertilisers is also covered.
Step-by-step explanationWorked examples
Worked example
The Haber process combines nitrogen and hydrogen to make ammonia: N₂(g) + 3H₂(g) ⇌ 2NH₃(g). The forward reaction is exothermic. Le Chatelier's principle suggests a low temperature and high pressure would give the highest yield. However, a compromise temperature (around 450°C) and pressure (around 200 atm) are used with an iron catalyst to get a fast enough reaction rate.
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Common mistakes
- 1Forgetting the three essential elements in NPK fertilisers (Nitrogen, Phosphorus, Potassium).
- 2Not knowing the raw materials for the Haber process: nitrogen (from the air) and hydrogen (from natural gas).
- 3Confusing the actual conditions used in the Haber process with the theoretical ideal conditions. A compromise is made to achieve an acceptable rate and yield at an economical cost.
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Frequently asked questions
Why do plants need nitrogen, phosphorus, and potassium?
Nitrogen is needed for making proteins and for healthy leaf growth. Phosphorus is needed for healthy root growth and for photosynthesis. Potassium is needed for flowering and fruiting and for overall plant health.
How are the phosphorus and potassium components of fertilisers obtained?
Phosphorus is obtained from phosphate rock, which is treated with acid to make soluble phosphates. Potassium is mined from the ground as potassium salts like potassium chloride.