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4 marksAcids, Bases and Salts

CSEC Chemistry · May/June 2008 · Paper 2 · Question 7(b)(ii)

A farmer observes that his bean crop has few, yellow leaves. An Agricultural Extension Officer decides to test the soil for ammonium and iron (III) ions, and pH.

The Officer finds the soil to be acidic and recommends the addition of lime. Suggest ONE possible reason for the acidic nature of the soil. Explain the effect of adding lime to the soil. Use a suitable equation to support your answer.

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Other parts of this question

  1. 7(a)(i)State the importance of EACH of the following factors in plant growth: Mineral balance[1 mark]
  2. 7(a)(ii)State the importance of EACH of the following factors in plant growth: pH[1 mark]
  3. 7(a)(iii)State the importance of EACH of the following factors in plant growth: Humus content of the soil[2 marks]
  4. 7(b)(i)Briefly describe the test for the presence of ammonium ions in a soil sample.[2 marks]
  5. 7(c)The farmer, in addition to adding the recommended lime to the soil, also decides to add an ammonium fertilizer, thinking that it would increase his crop yield.…[5 marks]

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