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Question

What happens when:

i CO2 is passed through lime water in a limited amount.

iiCO2 is passed through lime water in excess.


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Solution

The reaction of CO2 and limewaterCaOH2:

i

  • When CO2 reacts with limewater CaOH2, it forms the white precipitate of Calcium carbonateCaCO3 which is actually chalk and turns the solution color milky.

CO2gCarbondioxide+CaOH2sCalciumHydraoxideCaCO3sCalciumCarbonate+H2OlWater

ii

  • When CO2 reacts to the limewater CaOH2 in excess it forms Calcium bicarbonate CaHCO32 which is colorless. So, the milkiness of the solution disappears.

CaCO3sCalciumcarbonate+CO2gCarbondioxide+H2OlWaterCaHCO32sCalciumbicarbonate


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