Question

When CO² gas is passed through lime water

Answer 1

Carbon dioxide 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 dissolving to form a colourless solution of calcium hydrogencarbonate.

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Answer 2

When CO² gas is passed through lime water it turns milky and this is done as a test to prove that solution contains Carbon Dioxide .