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 and hence write the molecular masses of B

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Solution

Salt A (Sodium bicarbonate) $N a H C O_{3}$ commonly used in bakery products
, which on heating gets converted into another salt B ( ${N a}_{2} {C O}_{3}$ )
$2 N a H C O_{3} ⟺ {N a}_{2} {C O}_{3} + H_{2} O + {C O}_{2}$
C gas is ${C O}_{2}$

Salt B (ie; sodium carbonate) which itself used for removal of hardness of water and a gas C (ie; carbon dioxide ) is evolved.
When the gas C ( ${C O}_{2}$ )
is passed through lime water, turns it milky and precipitate $C a C O_{3}$ is formed.
Molecular mass of B ( ${N a}_{2} {C O}_{3}$ )is= $2 \times 23 + 12 + 16 \times 3 = 106$ g

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