Types of Chemical Reactions — Science STD 10 — Question
Tamilnadu BoardEnglish MediumSTD 10ScienceTypes of Chemical Reactions4 Marks
Question
Why the solution of slaked lime is used for whitewashing?
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Answer
A solution of slaked lime is used for whitewashing walls. Calcium hydroxide reacts slowly with the carbon dioxide in the air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of whitewashing and gives a shiny finish to the walls. It is interesting to note that the chemical formula for marble is also $CaCO_3.$
$Ca ( OH )_{2( aq )}+ CO _{2( g )} \rightarrow CaCO _{3( s )}+ H _2 O _{( l )}$
Slaked Lime Carbon dioxide Calcium Carbonate Water
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