Explain why farmers apply fertilisers to soil used for crop growth.
Explain why farmers avoid adding calcium hydroxide to the soil straight after ammonium sulfate has been added.
Calculate the percentage by mass of nitrogen in ammonium sulfate. Give your answer correct to three significant figures.
Complete the equation for the reaction between ammonium sulfate and aqueous sodium hydroxide. $(\text{NH}_4)_2\text{SO}_4 + 2\text{NaOH} \rightarrow \ldots + \ldots + \ldots$
Ammonium sulfate breaks down when heated. The reaction is endothermic. $3(\text{NH}_4)_2\text{SO}_4 \rightarrow 4\text{NH}_3 + 3\text{SO}_2 + \text{N}_2 + 6\text{H}_2\text{O}$ Finish and label the energy profile diagram for this reaction so that it shows the reactants, products and the enthalpy change of the reaction.