Answers section
Questions 2.6f
What is the meaning of a mixture?
Answers to Questions 2.6f
- 1. Cut green leaves into small pieces and crush them in a mortar, adding a little acetone (or ethanol) at a time.
- Filter the mixture and retain the filtrate.
- Place a drop of the filtrate at the centre of a filter paper held horizontally on a petri dish. Continue to add the filtrate dropwise at the same point (centre), each time allowing it to spread.
- Allow the paper to dry. The coloured rings obtained are the different substances that were in the leaf juice. How can we obtain them from here?
- Filtration. Chromatography begins with setting up the chromatography paper, whether horizontally or vertically, then applying leaf juice on the paper.
- Chromatography paper has narrow holes that allow solvent to spread (or rise) by capillarity, carrying the coloured substances with it.