Question

How does chlorine kills bacteria in water?

Answer 1

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Answer 2

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Chlorine is commonly used to kill bacteria in water. It is widely used to purify swimming pool, spa and drinking water. When it is dissolved in sodium hydrate it can be made into chlorine bleach or disinfectant. Disinfectant is used to kill germs, and chlorine bleach is used to whiten clothes and to disinfect.

Chlorine kills bacteria though a fairly simple chemical reaction. 
The chlorine solution you pour into the water breaks down into many different chemicals, including hypochlorous acid (HOCl) and hypochlorite ion (OCl-).

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