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

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.

Deduce whether the same red dye is used to make both types of ink. Give TWO reasons for your answer.