CourseCourseConceptConcept

Edexcel IGCSE Chemistry 1.11 Chromatograms Questions

Practise reading chromatograms to compare dyes, spot positions, solubility and mixture composition from paper evidence.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • link spots at the same height or Rf value to the same dye in different samples
  • use the number of spots to decide whether a colouring contains one or several dyes
  • explain why a spot left on the start line shows an insoluble dye or uncertain mixture

Edexcel IGCSE Chemistry 1.11 Chromatograms Questions question 1

[Maximum number: 6]

A student uses paper chromatography to investigate the dyes in five different inks, V, W, X, Y and Z.

This is what she uses.
- a beaker
- a piece of chromatography paper with a pencil line drawn near the bottom of the paper
- a solvent
- inks V, W, X, Y and Z

Question (a)

(a)

The chromatogram shows the results for inks V, W, X, Y and Z.

Figure for Question (a) — Edexcel IGCSE Chemistry
[ 6 ]

Question (i)

(i)

Explain which ink contains a dye that is insoluble in the solvent.

[ 2 ]

Question (ii)

(ii)

Explain which two inks contain the dye that is likely to be the most soluble in the solvent.

[ 2 ]

Question (iii)

(iii)

Explain which two inks may contain only one dye.

[ 2 ]
All question bank results loaded