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I always remind students about how to smell carefully here. Rapid inhalation of chlorine is not a healthy activity!
Chlorine water has a habit of losing its potency on storage. If it hasn't been freshly prepared it is important to check that it has a detectable chlorine smell.
Materials:
| Saturated chlorine water (2 cm3) | 0.02 M bromine water (2 cm3) |
| 0.05 M iodine in KI (2 cm3) | 0.4 M sodium hydroxide solution (5 cm3) |
| Test tubes | Dropping pipette |