Chemistryhard · Past Paper
What happens when Carbon dioxide is passed through limewater for a LONG time?
AIt stays milky
BThe milkiness disappears
CIt turns blue
DA black precipitate forms
✓ Correct Answer: B — The milkiness disappears
Excess CO2 reacts with the insoluble calcium carbonate to form soluble calcium bicarbonate, making the solution clear again.
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