Question
When carbon dioxide is passed through lime water it turns milky. Why?
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Answer
Lime water (Calcium hydroxide) combines with carbon dioxide to form a suspension of calcium carbonate which makes lime water milky.
$Ca(OH)_{2(aq)} + CO_{2(g)} \rightarrow CaCO_{3(s)} + H_2O_{(1)}$
$Ca(OH)_{2(aq)} + CO_{2(g)} \rightarrow CaCO_{3(s)} + H_2O_{(1)}$
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