Chlorine and Bromine water production:

Both of the following procedures MUST BE CARRIED OUT IN A FUME HOOD
Measure out 40ml of household bleach (do not use the expensive variety of bleach that has been thickened)
Add 40mL of 1M sulfuric acid and then dilute with water to 100mL
Take the prepared chlorine water and add potassium bromide crystals until you get a deep brown coloured solution.
To neutralise the bromine water add sodium thiosulphate crystals until the solution is colourless.

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