Question

Hello rainfaeries ~help me with these questions ​

Answer 1

Answer:

#7

Ans) Calcium hydroxide is produced by the reaction of water and calcium oxide also called slaked lime.

CaO + H2O → Ca(OH)

#8

Ans) When Calcium Hydroxide reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, it produces Calcium Carbonate (CaCO3), which creates a hard coating on the walls. That's why Calcium Hydroxide is used in white washing.

Answer 2

Explanation:

Calcium hydroxide is produced commercially by treating lime with water: CaO + H2O → Ca(OH) In the laboratory it can be prepared by mixing aqueous solutions of calcium chloride and sodium hydroxide.

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.