(a)[2]
Calculate the percentage by mass of nitrogen in ammonium phosphate.
(b)[1]
Explain the reason farmers apply nitrogen-containing fertilisers to their fields.
(c)[2]
Describe a test used for ammonia and state the result.
(d)[2]
Explain why applying calcium hydroxide to the soil at the same time as ammonium phosphate causes nitrogen to be lost from the soil.
(e)[3]
Calculate the concentration, in $\text{mol/dm}^3$, for the aqueous ammonia.