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4 marksAcids, Bases and Salts

CSEC Chemistry · January 2005 · Paper 2 · Question 2(b)(ii)

A student attempts to prepare Suspension Q by reacting calcium with dilute sulphuric acid. The reaction stops quickly, forming only a small amount of CaSO₄ with most calcium unreacted.

Outline a suitable laboratory method for preparing a dry sample of calcium sulphate. Include a relevant equation in your answer.

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Other parts of this question

  1. 2(a)Calculate the number of moles of Al(OH)₃ in 250 g of Suspension P. (Relative Atomic Mass: Al = 27, O = 16, H = 1).[3 marks]
  2. 2(b)(i)Explain why the reaction stops after a while.[2 marks]
  3. 2(c)(i)Which of the Suspensions, P or Q, could serve as an antacid?[1 mark]
  4. 2(c)(ii)Write a chemical equation to support your answer to (c) (i).[2 marks]
  5. 2(d)State THREE ways in which a colloid differs from a suspension.[3 marks]

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