which substance is used for whitewashing CaO or Ca(OH)2
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Quicklime
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Quicklime is used for whitewashing as it produces calcium hydroxide (CaOH) when it reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, as a result, it produces calcium carbonate (CaCO3) which creates a hard coating on the walls. CaO (s) + H2O (l) → Ca(OH)2(aq).
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