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02/11/2020 6:19 pm
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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.
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02/11/2020 6:25 pm
'A' is sodium hydrogencarbonate.
2NaHCO3 ('A') + heat → Na2CO3 ('B') + CO2 ('C')+ H2O
'B' is sodium carbonate used for removal of hardness of water. The gas 'C' is carbon dioxide gas, when passed through limewater, it turns milky due to formation of calcium carbonate.
Ca(OH)2 (Limewater) + CO2 → CaCO3 + H2O