Chemistry
Describe the two colour changes that take place when moist blue litmus is placed in a gas jar of chlorine. What are these colour changes that take place when chlorine water is exposed to sunlight?
Practical Chemistry
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Answer
Chlorine turns moist blue litmus red and finally bleaches it i.e., decolourizes it.
When chlorine water is exposed to sunlight, it changes to colourless from greenish yellow. This colour change happens because chlorine reacts with water to form hypochlorous acid which further breaks to form hydrochloric acid and oxygen gas.
Cl2 + H2O ⟶ HClO + HCl
HClO ⟶ HCl + [O]
[O] + colouring matter ⟶ bleached product
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