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In an experiment, paper chromatography was used to separate the coloured dyes in four different inks, W, X, Y and Z - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2023 - Paper 1
Question 1
In an experiment, paper chromatography was used to separate the coloured dyes in four different inks, W, X, Y and Z. (a) Figure 1 shows the chromatogram at the end ... show full transcript
Worked Solution & Example Answer:In an experiment, paper chromatography was used to separate the coloured dyes in four different inks, W, X, Y and Z - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2023 - Paper 1
Step 1
Which ink contains a single dye?
Answer
To determine which ink contains a single dye, we need to look at the chromatogram in Figure 1. In chromatography, when a dye separates into multiple spots on the chromatogram, it indicates the presence of more than one component in that ink. In this case, the ink that appears as a single spot is the one that contains only one dye. Upon examining the figure, the correct answer is:
B. X
Step 2
Which ink contains the greatest number of dyes?
Answer
To find which ink contains the greatest number of dyes, we again refer to Figure 1. The ink that shows the most spots on the chromatogram denotes the presence of multiple dyes. Counting the number of separate spots for each ink, we see:
- Ink W: 2 spots
- Ink X: 1 spot
- Ink Y: 3 spots
- Ink Z: 2 spots
Thus, the ink with the greatest number of dyes is:
C. Y