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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 chromatogaphy B crystalli... 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 the ink is chromatography. Chromatography is a technique that separates components of a mixture based on their different interactions with a stationary phase and a mobile phase. In this case, it effectively separates the coloured dyes in the ink.
Step 2
Step 3
Explain why the apparatus is used to separate water from ink.
Answer
The apparatus is used to distill water from the ink. The heating causes the water to vaporize, which then travels through the condenser. The cold water flowing through the condenser cools the vapour, turning it back into a liquid. This process allows for the separation of water from the ink as the ink remains in the flask while the water is collected as a distillate.