Question: Can you tell what happens when carbon dioxide is passed through lime water?

Answer: When Carbon Dioxide is passed through lime water, it turns lime water milky. 
CO2, that is, Carbon Dioxide reacts with Ca(OH)2 , that is, lime water, to form a white precipitate of CaCO3, Calcium Carbonate. Adding more carbon dioxide results in the precipitate dissolving to form a colourless solution of calcium hydrogencarbonate.

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