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When chlorinated water is allowed to stand in sunlight, the sun will heat the water a little bit, thus making the chlorine slightly less soluble in the water and causing a small amount to come out of solution as a gas. The amount is very small and poses no significant health hazards. The gas coming out of solution is part of what you would associate with the smell of chlorinated pools. Most tap water in the US is chlorinated, but the amount is so small that even if the water gets warmed by the sun, it still doesn't lower the solubility of the chlorine enough to make it come out of solution. That's why tap water (usually) doesn't smell like pool water.

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Q: State what happens when chlorine water is allowed to stand in sun light?
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