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.
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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