A solution of a substance ‘X’ is used for whitewashing.
- Name the substance “X’ and write its formula.
- Write the reaction of the substance ‘X’ named above with water.
- Substance X in the question is Calcium oxide or “Quick lime”.
- Calcium oxide (AKA slaked lime) reacts with water and forms calcium hydroxide and releases energy as heat.
Application: When we apply slaked lime to walls of building as a thin layer. Within 2 to 3 days, it reacts to atmospheric carbon dioxide to form calcium carbonate. Calcium carbonate is hard and shiny, so it protects the wall from harsh weather and also looks appealing.
Ca(OH2) aq. + CO2(g) ————> CaCO3 + H2O(l)
See also: Other solved questions from chapter 1.