The Haber Process & Fertilisers Flashcards
What is produced from the haberprocess?
Ammonia
What’s the formula for ammonia?
NH3
What’s the equation for the haber process?
Nitrogen + hydrogen -> (over iron catalyst) ammonia
Reversible reaction
Is the forward reaction of haber process exo or endo?
Exo
Where is nitrogen from for the haber process?
The air
Where is hydrogen from for the haber process?
Methane that’s reacted with steam
How can you increase the yield of ammonia made from the haber process?
Use high temperature (too expensive, dangerous = 450°)
Use higher pressure (expensive = 200atmospheres)
What are the conditions of the haber process?
450°C and 200atmospheres with iron catalyst
Describe process of haber process
Reactants (nitrogen and hydrogen) over iron catalyst at 450°c at 200atmospheres. Some ammonia reverses back until it reaches dynamic equilibrium. Ammonia condenses to liquid. Unused hydrogen is recycled.
What is the formulation of NPK fertilisers made of?
Nitrogen, phosphorus and potassium
What do NPK fertilisers do?
They help plants grow bigger and quicker by replacing missing nutrients
Advantages of NPK fertiliser over manure?
Less smelly, more available and easier to transport and use.
Where is nitrogen from for NPK fertilisers?
From ammonia reacting with nitric acid
Where is potassium from for NPK fertilisers?
Mined from rock
Where do you get phosphorus from for NPK fertilisers?
Rock mined then reacted with acids.
