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2 marksAcids, Bases and Salts

CSEC Chemistry · May/June 2009 · Paper 2 · Question 1(c)(i)

Sally needs to distinguish between vinegar and muriatic acid (hydrochloric acid) after labels were removed. She tried smelling but was unsure. Plan and design an experiment to determine which bottle contains which acid.

Outline the procedure for the experiment.

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Other parts of this question

  1. 1(a)(i)a)Describe what would be observed in the polystyrene cup in Figure 1.[2 marks]
  2. 1(a)(i)b)What does the observation you described in a) above indicate about the relative positions of zinc and copper in the reactivity series?[1 mark]
  3. 1(a)(i)c)Distinguish between an exothermic and an endothermic reaction.[2 marks]
  4. 1(a)(ii)a)Using the readings in Figure 2, complete Table 1 to show the final thermometer readings, and the changes in temperature.[2 marks]
  5. 1(a)(ii)b)On the graph paper provided on page 5, plot the temperature change (ΔT) against mass of zinc added.[3 marks]
  6. 1(a)(iii)c)From your graph, deduce the temperature change (ΔT) that will occur when 1.0 g of zinc is added to the copper(II) sulphate solution.[1 mark]
  7. 1(a)(iii)Calculate the minimum mass of zinc required to completely react with 100 cm³ of 0.20 mol dm⁻³ copper(II) sulphate. Relative atomic mass of Zn = 65.[2 marks]
  8. 1(a)(iv)Use the information in (iii) above to explain why the different masses of zinc used in Experiments 4 and 5 give approximately the same change in temperature.[1 mark]
  9. 1(a)(v)Another group of students performs a similar experiment but uses silver instead of zinc. No temperature change is observed. Account for this observation.[2 marks]
  10. 1(b)(i)Complete Table 2 to show all of the possible inferences and write ionic equations where indicated.[2 marks]
  11. 1(b)(ii)Suggest a possible identity of the solid, R:[1 mark]
  12. 1(c)(ii)List the materials necessary.[1 mark]
  13. 1(c)(iii)What evidence will result from your procedure to distinguish between the two acids?[1 mark]

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