General Science • ChemistryMedium
What happens when carbon dioxide gas is bubbled through clear lime water for a prolonged duration?
A. The solution remains perfectly clear and colorless
B. Milky white precipitate appears instantly and remains permanent
C. The milky white precipitate dissolves due to the formation of soluble calcium hydrogen carbonate✓ Correct Answer
D. A pungent yellow gas is evolved immediately
💡 Solution & Explanation
When carbon dioxide is passed through lime water containing calcium hydroxide, an insoluble white precipitate of calcium carbonate forms, turning the solution milky. However, if carbon dioxide is bubbled through continuously for an extended period, the insoluble carbonate reacts further with excess carbon dioxide and water to produce soluble calcium bicarbonate, causing the milky turbidity to disappear and yielding a clear solution. Distractors assume the reaction stops at the precipitation stage. Limewater is an aqueous solution of calcium hydroxide.
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