Give a reason why the start line is drawn in pencil rather than in ink.
- Edexcel - GCSE Chemistry Combined Science - Question 1 - 2016 - Paper 1
Question 1
Give a reason why the start line is drawn in pencil rather than in ink.
Worked Solution & Example Answer:Give a reason why the start line is drawn in pencil rather than in ink.
- Edexcel - GCSE Chemistry Combined Science - Question 1 - 2016 - Paper 1
Step 1
Give a reason why the start line is drawn in pencil rather than in ink.
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Answer
The start line is drawn in pencil because pencil is insoluble in the solvent used for chromatography. If ink were used, it could dissolve into the solvent and interfere with the separation of the colored inks.
