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What do you observe in the …

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What do you observe in the reaction of CO2 with lime water

Posted by Rudra Pratap Singh Sisodiya 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 7 months ago

Formation of water soluble calcium bicarbonate
When CO2 is passed through lime water, it turns milky due to the formation of calcium carbonate which is sinsoluble in water.
limewaterCa(OH)₂+CO₂⟶milkinessCaCO₃+H₂O

However, when excess of CO2 is passed through this solution, the milkiness disappears. This is due to the formation of calcium bicarbonate which is colorless and soluble in water.
milkinessCaCO₃+H₂O+excessCO₂⟶water solubleCa(HCO3)₂

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