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What happens when SO2gas is passed throu...

What happens when `SO_2`gas is passed through lime water first slowly and then in excess ?

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Lime water turns milky first then turns colourless again.
`SO_2 + Ca(OH)_2 rarr ubrace(CaSO_3+H_2O)_("Milky")`
`underset("Excess")(SO_2) + Ca(OH)_2 rarr ubrace(CaHSO_3+H_2O)_("Colourless")`
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