Preparing Fertilisers Flashcards
0
Q
Describe how to make ammonium nitrate fertiliser
A
Add methyl orange indicator to ammonia - turns yellow
Slowly add nitric acid, swirl until just red
Ammonia now neutralised to ammonia nitrate solution
Evaporate and leave to crystallise
To be pure repeat with same volume of nitric acid but no indicator
1
Q
What do you need to make fertiliser in the lab?
A
Ammonia and nitric acid to give you ammonium nitrate ( salt)
2
Q
What is the yield?
A
Mass of product is yield of reaction
3
Q
What is % yield?
A
Between 0 and 100% but in practise never get 100%
Percentage yield is how much get if all reactant was converted into product
