Difference between revisions of "NPK"
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: [[NPK]] can also include other [[mineral]]s such as [[Calcium Phosphate]] and [[Calcium Sulphate]] as [[plant]]s also need both [[Calcium]] and [[Sulphur]]. | : [[NPK]] can also include other [[mineral]]s such as [[Calcium Phosphate]] and [[Calcium Sulphate]] as [[plant]]s also need both [[Calcium]] and [[Sulphur]]. | ||
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| + | ===References=== | ||
| + | ====AQA==== | ||
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| + | :[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d196 ''NPK fertilisers, page 105, GCSE Chemistry; The Revision Guide, CGP, AQA ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''NPK fertilisers, pages 234-235, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''NPK fertilisers, pages 268-9, GCSE Chemistry, Hodder, AQA ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''NPK fertilisers, pages 304, 305, GCSE Chemistry, CGP, AQA ''] | ||
Latest revision as of 14:37, 10 November 2019
Key Stage 4
Meaning
NPK is a mixture of fertilising compounds used in agriculture.
About NPK
- NPK stands for Nitrogen (N), Phosphorous (P), Potassium (K).
- NPK is generally made by reacting Ammonia with Nitric Acid, reacting Ammonia with Phosphoric Acid and combining these in a mixture with Potassium Chloride which is mined from the ground.
Ammonia + Nitric Acid → Ammonium Nitrate
- <chem>NH3 + HNO3 -> NH4NO3</chem>
Ammonia + Phosphoric Acid → Ammonium Phosphate
- <chem>3NH3 + H3PO4 -> (NH4)3PO4</chem>
- NPK can also include other minerals such as Calcium Phosphate and Calcium Sulphate as plants also need both Calcium and Sulphur.