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.

September 29, 2024

Answer

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: Sodium bicarbonate (baking soda)

B: Sodium carbonate (washing soda)

C: Carbon dioxide (CO₂)

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