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2 marksAcid/Base Equilibria

CAPE Chemistry Unit 1 · 2006 · Paper 1 · Question 8(b)(i)

Samples of TWO different brands of black ink are separated into their constituent parts using paper chromatography. Both samples contain a red dye. In the first sample the solvent travels 7.54 cm, while the red dye travels 4.67 cm. In the second sample the red dye travels 3.31 cm while the solvent travels 5.34 cm.

Calculate the Rᶠ values for the TWO samples.

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Other parts of this question

  1. 8(a)(i)What is meant by retention time as applied to gas liquid chromatography (GLC)?[1 mark]
  2. 8(a)(ii)Distinguish between a stationary phase and a mobile phase used in chromatography.[2 marks]
  3. 8(a)(iii)Give ONE example EACH of commonly used stationary and mobile phases in GLC.[2 marks]
  4. 8(b)(ii)Deduce whether the same red dye is used to make both types of ink. Give TWO reasons for your answer.[3 marks]

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