Question

Salt A, commonly used in bakery products, on heating, gets converted into another salt B. B is used for the 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

$\bullet$ Salt A is sodium bicarbonate which is used as baking soda​.
$2{\text{NaHCO}}_3\text{(s)}\stackrel{\text{Heat}}{\to }{\text{Na}}_2{\text{CO}}_3\text{(s)}+{\text{CO}}_2\text{(g)}+{\text{H}}_2\text{O}\text{(l)}$

$\bullet$ Salt B is sodium carbonate, which is used to remove the hardness of water.​

$\bullet$ C is carbon dioxide gas, which turns lime water milky.​