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Chlorine gas has the ability to disproportionate.

That is a molecule of chlorine can form two ions of opposite charge simultaneously . Hence

Cl2 = Cl^(-) + Cl^(+)

When dissolved in water

These ions form HCl(hydrochloric Acid) & HClO (Bleach;Hypochlorous acid).

The reaction equation is

H2O +Cl2 = HCl + HClO

These two compounds are bacterioccides. They kill bacteria. Thereby water is safe to drink.

At the water treatment plant, before it is pumped to houses factories etc., Chlorine gas is bubbled into the water. to form the two above compounds.

Only sufficient chlorine is bubbled in , in order to kill bacteris, but without seriously changing the taste of water. If occasionally the water treatment plant has been a bit 'heavy handed' with the addition of chlorine, you may have a slightly bleachy taste.

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lenpollock

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Q: How does chlorine make water safe to drink?
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