Question

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.

Answer 1

Baking powder (NaHCO₃), Salt A is commonly used in bakery products. On heating, it forms sodium carbonate (Na₂CO3), B and CO₂ gas, C is evolved. When CO₂ gas is passed through lime water it forms calcium carbonate (CaCO₃), which is slightly soluble in water making it milky. 

A — NaHCO₃;    B — Na₂CO₃;      C — CO₂ gas