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Carbon and Its Compounds — CHEMISTRY STD 8 — Question

ICSE BoardEnglish MediumSTD 8CHEMISTRYCarbon and Its Compounds2 Marks
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.
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Answer

$\underset{\text { Lime water }}{ Ca[OH ]_2}+ CO_2 \longrightarrow \underset{\text { (Insoluble) milky }}{ CaCO_3 \downarrow+ H_2O }$
When $CO_2$ is passed in excess, milkiness disappears due to formation of bicarbonate which is soluble in water.
$\ce{CaCO _3}+ \ce{H _2O} + \ce{CO_2} \rightarrow\ce{Ca\left[ HCO_3\right]_2}$

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