Chemistryhard · Past Paper
When CO2 is passed through limewater for a long time, the milkiness disappears due to the formation of:
A$CaCO_3$
B$CaO$
C$Ca(HCO_3)_2$
D$Ca(OH)_2$
✓ Correct Answer: C — $Ca(HCO_3)_2$
Soluble calcium bicarbonate is formed when excess CO2 reacts with the insoluble calcium carbonate precipitate.
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