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The diagram shows a chromatogram of the coloured substances in four different drinks, A, B, C and D - Edexcel - GCSE Chemistry - Question 1 - 2016 - Paper 1

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The diagram shows a chromatogram of the coloured substances in four different drinks, A, B, C and D. (a) (i) State the letter of the drink that contains only one co... show full transcript

Worked Solution & Example Answer:The diagram shows a chromatogram of the coloured substances in four different drinks, A, B, C and D - Edexcel - GCSE Chemistry - Question 1 - 2016 - Paper 1

Step 1

State the letter of the drink that contains only one coloured substance.

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Answer

Looking at the chromatogram, drink B is the only one that shows a single spot, indicating that it contains only one coloured substance.

Step 2

Which of the drinks, A, B, C or D, contains the illegal coloured substance?

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Answer

To determine which drink contains the illegal coloured substance with an Rf value of 0.71, we find the corresponding position on the chromatogram. The drink with a spot closest to the Rf value of 0.71 is drink D. Therefore, a cross (X) should be placed in the box next to drink D.

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