Compound ‘A’ when dissolved in water gives compound ‘B’ which used in whitewashing. Compound ‘B’ reacts with CO2 to form a white precipitate of compound ‘C’. Identify compounds ‘A’ ‘B’ and ‘C’. Also write the equations involved.

Certainly! Let’s break down the compounds step by step.

1. Compound ‘A’: This is calcium hydroxide, also known as slaked lime. Its chemical formula is Ca(OH)₂. When it is dissolved in water, it forms a basic solution.

2. Compound ‘B’: When calcium hydroxide is mixed with water, it produces calcium hydroxide solution, which can also be referred to as lime water. This is used in whitewashing.

Dissolution Reaction:

Ca(OH)₂ (s) + H₂O → Ca(OH)₂ (aq)

3. Compound ‘C’: When compound ‘B’ (calcium hydroxide) reacts with carbon dioxide (CO₂) from the air, it forms calcium carbonate, which appears as a white precipitate.

Reaction with CO₂:

Ca(OH)2 (aq) + CO2(g) → CaCO3(s) + H2O(l)

In summary:

– Compound A: Calcium hydroxide (Ca(OH)₂)
– Compound B: Calcium hydroxide solution (lime water)
– Compound C: Calcium carbonate (CaCO₃)