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
The pH of Cola is 2.9. 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
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
Complete the sentence. The start line should be drawn with a ruler and ........................................
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Answer
The start line should be drawn with a ruler and pencil so it will not run, smudge, or dissolve.
Step 4
Give a reason for your answer.
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Answer
This ensures that the start line remains distinct and does not interfere with the results of the chromatography experiment.
Step 5
Suggest three conclusions you can make from the student’s results.
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Answer
There are three colors in Cola as observed from the chromatogram.
There are two colors in the Fruit drink.
One of the colors in Cola and the Fruit drink is the same, indicating a shared ingredient.
Step 6
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 stationary phase and different volatilities.
Step 7
Tick (✓) one question. Should caffeine be an ingredient in drinks?
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Step 8
Give two reasons why the other questions cannot be answered by science alone.
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They can depend on personal opinion or lifestyle choices.
They may involve ethical, social, or economic issues that science cannot determine alone.
