0654.C12.3.01 — Describe how paper chromatography is used to separate mixtures of soluble coloured substances, using a suitable solvent: past paper questions
Real questions on 0654.c12.3.01 — describe how paper chromatography is used to separate mixtures of soluble coloured substances, using a suitable solvent
The newest 8 of 8 written questions. Open one to see it on the real paper.
- 0973/41 · May/June 2023 · Q2b(iii)[1]
One of the substances in dye D remains on the pencil line. Explain why.
See it on the paper → - 0973/41 · May/June 2023 · Q2b(iv)[2]
Use Fig. 2.2 to calculate the R f value for dye A. R f value =
See it on the paper → - 0973/31 · October/November 2022 · Q2a(ii)[1]
to separate a mixture of dyes
See it on the paper → - 0973/41 · October/November 2020 · Q2a[1]
State why the start line is drawn using pencil, rather than using ink.
See it on the paper → - 0973/41 · October/November 2020 · Q2c[1]
State whether the fruit drink contains the harmful food colouring X. Explain your answer.
See it on the paper → - 0973/42 · May/June 2020 · Q2b(i)[2]
Calculate the R f value for dye A. R f value =
See it on the paper → - 0973/42 · May/June 2020 · Q2b(ii)[2]
State which dye cannot be in the ink sample. Explain your answer. dye explanation
See it on the paper → - 0973/42 · May/June 2020 · Q2b(iii)[1]
A solvent is used during chromatography. Define the term solvent.
See it on the paper →
What examiners said
Some candidates understood that substance D was insoluble. Incorrect ideas included suggestions about purity and reactiveness.
— Examiner report, May/June 2023, 0973/41 Q2(b)(iii) (Cambridge)
Most candidates could recall and use the formula for Rf. A range of values for the Rf were allowed as there was not consistency in how to measure the distance travelled in the diagram. Some subtracted the distances and a minority inverted the formula.
— Examiner report, May/June 2023, 0973/41 Q2(b)(iv) (Cambridge)
Most candidates realised that pencil is used to draw the chromatography start line because it is insoluble.
— Examiner report, October/November 2020, 0973/41 Q2(a) (Cambridge)
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