Chemistry · Oct / Nov 2016 · Paper 22 · Question A2
5070
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The question as text
A2 Farmers add fertilisers such as ammonium sulfate to the soil to increase the rate of plant growth.
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A2(a)[2]
NH4 + (1)
SO4 2– (1)
2
A2(b)[2]
warm with sodium hydroxide (1)
(damp red) litmus turns blue/ammonia produced turns red litmus blue (1)
2
A2(c)[1]
OH– + H+ → H2O (1)
1 Total: 5
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