Chemistry In Society: Fertilisers
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What 3 substances do growing plants require?
Nitrogen, Phosphorus, and Potassium
What are fertilisers used for?
To restore elements, essential for healthy plant growth, to the soil
Why do fertilisers need to be soluble?
So that they can be absorbed with water in the roots of plants
What is the formula for ammonia?
NH₃
When ammonia dissolves in water, what colour would pH paper turn and why?
blue/purple - ammonia solution is alkali
What is the name of the process used to make ammonia?
Haber process
What are the two reactants for the Haber process?
N₂ + H₂
What is the balanced chemical equation to show the production for ammonia?
N₂ + 3H₂ ⇌ 2NH₃
What is the catalyst used in the Haber process?
Iron powder
What is the process used to make Nitric acid?
Ostwald process
What are the 3 starting materials required in the Ostwald process?
Ammonia, oxygen and water
Describe the Ostwald process
First the NH₃ and O₂ are converted into NO₂, then water is added to dissolve the NO₂ into nitric acid (HNO₃)
What is the catalyst used in the Ostwald process?
Platinum