Limewater turns milky when CO2 is passed through it. – InterviewSolution

1.	Limewater turns milky when CO2 is passed through it.
Answer» Limewater traditionally means a weak solution of the alkali calcium hydroxide Ca(OH)₂ . When CO₂ is passed through limewater, it reacts with calcium hydroxide to form insoluble particulates (precipitate) of Calcium carbonate (CaCO₃). Calcium carbonate is weak basic salt and this gives a milky white precipitate. Hence, lime water turns milky when CO₂ gas is passed through it.

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