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3 marksMole Concept

CSEC Chemistry · January 2005 · Paper 2 · Question 2(a)

Figure 2 shows labels from two bottles, Suspension P (Al(OH)₃ - 78%) and Suspension Q (CaSO₄ - 83%), indicating the formulae and percentage composition of active ingredients.

Calculate the number of moles of Al(OH)₃ in 250 g of Suspension P. (Relative Atomic Mass: Al = 27, O = 16, H = 1).

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Other parts of this question

  1. 2(b)(i)Explain why the reaction stops after a while.[2 marks]
  2. 2(b)(ii)Outline a suitable laboratory method for preparing a dry sample of calcium sulphate. Include a relevant equation in your answer.[4 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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