What is milk of lime how it is used to prepare calcium bicarbonate?
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A suspension of calcium hydroxide or hydrated lime in water is known as milk of lime .
Carbon dioxide passed into limewater gives a milky solution, due to precipitation of an insoluble suspension of calcium carbonate:
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
If excess CO2 is added, the following reaction takes place:
CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq)
The milkiness disappears since calcium bicarbonate is water-soluble.
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