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Both bromine water and chlorine water deteriorate quite quickly on storage. It is important to check both solutions are sufficiently viable to give noticeable results in this experiment.
This is quite a good experiment to test students' organisational skills. The concept of the control should help to develop students' observational skills.
Materials:
| Saturated chlorine water (2 cm3) | 0.1M potassium chloride (6 cm3) |
| 0.05 M bromine water (2 cm3) | 0.1M potassium bromide (6 cm3) |
| 0.05 M iodine in KI (2 cm3) | 0.1M potassium iodide (6 cm3) |
| Petroleum spirit 120°C - 160°C (6 cm3) | |
| Test tubes and bungs | Dropping pipette |