What do you observe when carbon dioxide gas is passed through lime water.

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Solution

When Carbon dioxide $({CO}_{2})$ gas is passed through lime water $[\begin{matrix} Ca {(OH)}_{2} \end{matrix}]$ it forms Calcium carbonate $({CaCO}_{3})$ which is a white precipitate.
The solution turns to milky white.
$Ca {(OH)}_{2} (aq) + {CO}_{2} (g) \to {CaCO}_{3} (s) + H_{2} O (l) Lime Carbon Calcium Water water dioxide carbonate$

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