chemical reaction for white washing

Asked by  | 8th Mar, 2009, 11:08: AM

Expert Answer:

It gets heated up as CaO produces heat energy by the formation of the hydrate, as in the following equation:

CaO + H2O ↔ Ca(OH)2 + 63.7kJ/mol of CaO
Whitewash cures through a reaction with carbon dioxide in the atmosphere to form calcium carbonate in the form of calcite, a reaction known as carbonatation.When the paint initially dries it is uncured, and has almost no strength. It takes up to a few days, depending on climate, to harden. Thus in the given case the walls get a shiny appearence after two days.

Answered by  | 8th Mar, 2009, 07:27: PM

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