Question

what are the chemical reactions involved in the white washing walls and why white washing gives shiny finish

Answer 1

Answer:

CaCO3 +H2O

Explanation:

Ca(OH)2 When applied to the the wall it reacts with the atmospheric carbon dioxide

Ca(OH)2+CO2--->CaCO3+H2O

here CaCO3 is a white colour precipitate so the walls will give a shiny finish

Answer 2

The chemical reactions involved in the whitewashing walls is given below:

$CaO + H_2O ----- > Ca(OH)_2$

$Ca(OH)_2(aq) + CO_2(g) -- > CaCO_3(s) + H_2O(l)$

Why whitewashing give a shiny finish?

Whitewashing gives a shiny finish to walls because of the formation of a thin layer of calcium carbonate $(CaCO_3)$ on the walls after 2 or 3 days of whitewashing.

Explanation :

• The whitewashing of our walls is carried out by using a suspension of slaked lime $[Ca(OH)_2]$.

• Slaked lime $[Ca(OH)_2]$ is also known as Calcium hydroxide.

• Suspension of slaked lime is prepared by adding water to quick lime (CaO).
• $CaO + H_2O ----- > Ca(OH)_2$

• Calcium hydroxide $[Ca(OH)_2]$ reacts with carbon dioxide $(CO_2)$ present in the air slowly to form a thin layer of calcium carbonate $(CaCO_3)$ on the walls.

          $Ca(OH)_2(aq) + CO_2(g) -- > CaCO_3(s) + H_2O(l)$

• This above reaction takes about 2-3 days to get completed and the drying of water in about same time leads to the formation of a shining white layer on the walls.

Learn more on Brainly :

Why walls gives shiny finish after 2 or 3 days of white washing?

https://brainly.in/question/1154970

Which decomposition reaction followed by two combination reactions are involved the white wash walls.

https://brainly.in/question/404326

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