O-LevelChemistryAcids, Bases & Salts5070/22 · Oct/Nov 2016 · Q25 Marks
Farmers add fertilisers such as ammonium sulfate to the soil to increase the rate of plant growth.
- (a)Write the formulae of the ions present in ammonium sulfate. and[2]
- (b)Describe a test for ammonium ions. test observation[2]
- (c)When ammonia dissolves in water, ammonium ions and hydroxide ions are formed. Write the ionic equation for the reaction of aqueous ammonia with sulfuric acid.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [1] NH4+
- [1] SO42-
- [1] warm with sodium hydroxide
- [1] (damp red) litmus turns blue/ammonia produced turns red litmus blue
- [1] OH- + H+ → H2O
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