The incident of Tom Sawyer whitewashing a fence as punishment is a famous image in American literature. White wash is a paint made from slaked lime and it becomes shiny after its application on walls due to a reaction with carbon dioxide. This type of reaction is called carbonation.
a) Write the formulae of the substance called slaked lime. 1 b) Write a chemical equation for its preparation. 1
c) Classify the above reaction 1
d) What causes the shine of whitewashed walls due to
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Whitewash, or calcimine, kalsomine, calsomine, or lime paint is a type of paint made from slaked lime (calcium hydroxide, Ca(OH)2) or chalk calcium carbonate, (CaCO3), sometimes known as "whiting". Various other additives are sometimes used.
A solution of slaked lime (Ca(OH)2) is used to white wash the walls. Calcium hydroxide reacts with the carbon dioxide in air to form thin layer of calcium carbonate on the walls. It gives a shiny finish to the walls
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