38. Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C.
Steps: Heating: \(2NaHCO_3 \xrightarrow{heat} Na_2CO_3 + H_2O + CO_2\). CO₂ passed through lime water (Ca(OH)₂) forms CaCO₃ (milky).