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What are the products formed in sequence when excess of CO2 is passed in slaked lime?

1. (Ca(HCO3)2, CaCO3)
2. (CaCO3, Ca(HCO3)2)
3. (CaO, Ca(HCO3)2)
4. (CaO, CaCO3)

Correct answer: (CaCO3, Ca(HCO3)2)

Solution

When excess carbon dioxide is passed through slaked lime (calcium hydroxide), it first reacts to form calcium carbonate, which can then further react with additional CO2 to form calcium bicarbonate, making the sequence CaCO3 followed by Ca(HCO3)2.

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