O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2020 · Q31 Mark

A paper chromatography experiment is carried out to find an Rƒ value for Fe³⁺(aq). The result is shown. To make the spot containing Fe³⁺(aq) more visible, the paper is sprayed with aqueous sodium hydroxide so that a precipitate of iron(III) hydroxide forms. Under the conditions of the experiment, the Rƒ of Fe³⁺(aq) is given by ......1...... and the colour of the precipitate is ......2....... Which row correctly completes gaps 1 and 2?

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Ax / y, red-brown

Bx / y, green

Cy / x, red-brown

Dy / x, green

✓ Correct answer

A: x / y, red-brown

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 2, question 3.

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