A technician uses paper chromatography to compare dyes removed from coloured textile fibres. A wide dropper produces a broad patch of each sample on the origin line.
Why could the broad patches reduce the accuracy of the distances measured for the separated dyes?
The solvent may rise unevenly up the paper past the broad patches
The centre of each separated spot may be difficult to judge
Each dye may become less soluble in the solvent and stop moving early
The larger amount of each dye may make it travel further up the paper
113 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.