Question

why calcium hydroxide is used for white washing ?

Answer 1

calcium hydroxide is used for white washing because it slowly react with co2 in air and forms a layer of calcium carbonate which forms after 2 or 3 days and give shiny finish to the walls.

Answer 2

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