Question

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Answer 1

Explanation:

The gas liberated on reaction of sodium carbonate and dil. HCl is CO2 which reacts with limewater (a solution of calcium hydroxide, Ca(OH) 2), to form a white precipitate (appears milky) of calcium carbonate, CaCO 3. Adding more carbon dioxide results in the precipitate to dissolve in the solution to form a colourless solution of calcium hydrogencarbonate and hence the which ppt disappears.

Answer 2

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