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.
NCERT Class X
Science - Exemplar Problems
Chapter_Acids, Bases and Salts
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477
Salt A - probably baking soda - sodium bicarbonate : Na HCO₃ . It is a white solid powder.
When it is heated, 2 Na HCO₃ ==> Na₂ CO₃ + H₂O + CO₂
Sodium carbonate is a white powder - which is washing soda.. it removes hardness of water.
The gas is carbon dioxide.
When it is passed through lime water, (calcium hydroxide - Ca (OH)₂ ), then calcium carbonate Ca CO₃ white precipitate is formed.
When it is heated, 2 Na HCO₃ ==> Na₂ CO₃ + H₂O + CO₂
Sodium carbonate is a white powder - which is washing soda.. it removes hardness of water.
The gas is carbon dioxide.
When it is passed through lime water, (calcium hydroxide - Ca (OH)₂ ), then calcium carbonate Ca CO₃ white precipitate is formed.
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Salt A is NaHCO3 as it's used in bakery
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