Coal and limestone are heated in a furnace. Quicklime is formed, but it contains ash. To get ash-free quicklime, limestone is heated with producer gas.


1.        To make slaked lime and limewater.
CaO + H2O Ca(OH)2
2.        To dry ammonia.
3.        To produce limelight, an intense white light created by heated CaO.
4.        To make mortar. A thick paste of slaked lime, 3-4 parts sand, is used as mortar. On drying, CaO remains, which reacts with carbon dioxide to form calcium carbonate.
Ca(OH)2 CaO + H2O
CaO + CO2 CaCO3

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