State where the hydrogen and nitrogen used to manufacture ammonia by the Haber process come from.
Ammonia is produced when aqueous ammonium sulfate is heated with sodium hydroxide. $(\text{NH}_4)_2\text{SO}_4 + 2\text{NaOH} \rightarrow 2\text{NH}_3 + \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}$ A student adds $4.50\,\text{g}$ of sodium hydroxide to $50.0\,\text{cm}^3$ of $1.25\,\text{mol dm}^{-3}$ aqueous ammonium sulfate. Show by calculation that ammonium sulfate is in excess.
When dilute sodium hydroxide is electrolysed, hydroxide ions are changed into oxygen and water at the anode. Construct the ionic equation for the reaction taking place at the anode.
The first stage in the nitrate-ion test is to heat aluminium and sodium hydroxide with a solution containing nitrate ions. State the type of chemical reaction that takes place when a solution containing nitrate ions is heated with aluminium and sodium hydroxide.
Nitrates from fertilisers cause eutrophication when they are washed out of soils into rivers. Describe the process of eutrophication.