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An ink is a mixture of coloured substances dissolved in water - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2018 - Paper 1
Question 4
An ink is a mixture of coloured substances dissolved in water. (a) Which method is used to separate the coloured substances in the ink? A chromatography B crysta... show full transcript
Worked Solution & Example Answer:An ink is a mixture of coloured substances dissolved in water - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2018 - Paper 1
Step 1
Which method is used to separate the coloured substances in the ink?
Answer
The correct method to separate the coloured substances in ink is chromatography (option A). This method allows for the separation of different substances based on their movement through a medium. The other options are not suitable for this purpose.
- B crystallisation: This does not effectively separate colours.
- C filtration: This method is typically used for separating solids from liquids, not for different colours in a solution.
- D fractional distillation: This is more suitable for separating mixtures based on boiling points and will not separate colours in the ink.
Step 2
Step 3
Explain why the water is used in the condenser.
Answer
The water in the condenser serves to cool the vapor. This cooling facilitates the condensation process, allowing vapor to transition back into liquid form. As the heated ink vapor passes through the condenser, the cold water absorbs heat, causing the vapor to cool and revert to liquid, which can then be collected separately.