Chemistry
What do you observe when CO2 is passed through lime water first and then a little in excess? Write balanced equations for your observation.
Practical Chemistry
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Answer
When CO2 is passed through lime water first in small amounts it turns lime water milky. This is due to the formation of insoluble calcium carbonate.
Ca(OH)2 + CO2 ⟶ CaCO3 ↓ + H2O
When excess of the gas is passed through the solution, milkiness disappears. This is due to the formation of a soluble bicarbonate.
CaCO3 + CO2 + H2O ⟶ Ca(HCO3)2 [soluble]
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