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Question
‘When carbon dioxide is bubbled into lime water, the lime water turns milky and when bubbled in excess the milkiness disappears’. Give balanced equations to support the statement.
Solution
\[\ce{\underset{\text{Lime water}}{Ca[OH]2} + CO2 ->\underset{\text{(Insoluable) milky}}{CaCO3↓} +H2O}\]
When CO2 is passed in excess, milkiness disappears due to formation of bicarbonate which is soluble in water.
CaCO3 + H2O + CO2 → Ca[HCO3]2
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