The label shows the ingredients in a drink called Cola - AQA - GCSE Chemistry - Question 1 - 2014 - Paper 1
Question 1
The label shows the ingredients in a drink called Cola.
Ingredients:
Carbonated water
Sugar
Colouring
Phosphoric acid
Flavouring
Caffeine
1 (a) (i) The pH of carbo... show full transcript
Worked Solution & Example Answer:The label shows the ingredients in a drink called Cola - AQA - GCSE Chemistry - Question 1 - 2014 - Paper 1
Step 1
1 (a) (i) Name the ingredient on the label that lowers the pH of Cola to 2.9.
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Answer
The ingredient that lowers the pH of Cola to 2.9 is phosphoric acid.
Step 2
1 (a) (ii) Which ion causes the pH to be 2.9?
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Answer
The ion that causes the pH to be 2.9 is the hydrogen ion (H⁺).
Step 3
1 (b) (i) Complete the sentence.
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The start line should be drawn with a ruler and pencil so it will not run, smudge, or dissolve. This ensures that the start line remains clear and does not affect the chromatography results.
Step 4
1 (b) (ii) Suggest three conclusions you can make from the student's results.
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Answer
There are three distinct colors in the Cola sample.
The fruit drink contains two colors, and one of those colors is the same as one of the colors in Cola.
The distribution of colors in the Cola sample shows that it has a higher Rf value compared to the fruit drink.
Step 5
1 (c) Why do different compounds separate in a gas chromatography column?
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Different compounds separate in a gas chromatography column because they have different attractions to the column material and different boiling points, which affects their movement speed.
Step 6
1 (d) (i) Tick one question.
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Answer
Is there caffeine in a certain brand of drink?
Step 7
1 (d) (ii) Give two reasons why the other questions cannot be answered by science alone.
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The question about whether caffeine should be an ingredient in drinks is based on personal opinion or lifestyle choices.
The question regarding how much caffeine people should drink involves ethical, social, or economic issues.
