Question

On passing excess co2 gas throughlime water , it first turns milky and the bevimes colourless

Answer 1

When CO2 is passed through lime water it turns lime water milky. This is because of the formation of calcium carbonate. When excess CO2 is passed through the solution it turns colourless due to the formation of calcium hydro carbonate which is soluble in water (Ca(HCO3)2

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