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3 marksMixtures and Separations

CSEC Chemistry · January 2007 · Paper 2 · Question 1(a)(vi)

A student investigates the effect of temperature on the solubility of two salts, R and T, collecting data shown in Table 1.

Suggest a way for obtaining an essentially pure sample of R from a sample which has been contaminated with a small amount of T.

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Other parts of this question

  1. 1(a)(i)Using the graph paper provided on page 3, plot the data for the solubility of R and T given in Table 1.[4 marks]
  2. 1(a)(ii)Describe the effect of increasing temperature on the solubilities of R and T.[1 mark]
  3. 1(a)(iii)Determine the temperature at which the solubilities of R and T are equal.[1 mark]
  4. 1(a)(iv)Determine the solubility of T at 75°C.[1 mark]
  5. 1(a)(v)Which of the two salts is more soluble at 5°C?[1 mark]
  6. 1(b)(i)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: A sample of Solid W is moistened with sodium hydroxide solution and…[1 mark]
  7. 1(b)(ii)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: To an aqueous solution of W, a few drops of acidified silver nitrate…[2 marks]
  8. 1(b)(iii)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: To an aqueous solution of W, a solution containing barium ions is…[3 marks]
  9. 1(b)(iv)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: Dilute hydrochloric acid is added to the mixture from (iii) above.…[2 marks]
  10. 1(c)(i)Procedure:[2 marks]
  11. 1(c)(ii)Draw a fully labelled diagram of the apparatus required to conduct your experiment.[3 marks]
  12. 1(c)(iii)Data to be collected:[2 marks]
  13. 1(c)(iv)SAMPLE calculation to be performed to determine the heat of combustion per mole of the fuel:[2 marks]
  14. 1(c)(v)TWO possible sources of error in your experiment:[2 marks]

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