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4 marksGravimetric Methods of Analysis

CAPE Chemistry Unit 2 · 2017 · Paper 2 · Question 2(d)(ii)

A 0.496 g sample of limestone, CaCO3, is dissolved in acidic solution. The calcium ions are precipitated as hydrated calcium oxalate, CaC2O4·H2O, yielding a dry precipitate of mass 0.619 g.

Calculate the percentage of Ca2+ in the sample.

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Other parts of this question

  1. 2(a)(i)Define the term 'accuracy'.[2 marks]
  2. 2(a)(ii)Define the term 'precision'.[2 marks]
  3. 2(b)Suggest a separation technique that would be MOST effective in the extraction of eugenol (oil) from cloves (plant) in its natural source.[1 mark]
  4. 2(c)(i)From Figure 1, list the letters of THREE pieces of apparatus that could be used in solvent extraction.[3 marks]
  5. 2(c)(ii)From Figure 1, list the letters of TWO pieces of apparatus that could be used in gravimetric analysis.[2 marks]
  6. 2(d)(i)Write the equation for the formation of the dry calcium oxalate precipitate.[1 mark]

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