General Science • ChemistryHard
What happens when an excess of carbon dioxide gas is bubbled through a freshly prepared aqueous solution of calcium hydroxide for a prolonged duration?
A. The milky white precipitate of calcium carbonate remains unchanged indefinitely
B. The milky white precipitate dissolves completely due to the formation of soluble calcium bicarbonate✓ Correct Answer
C. The solution turns bright pink due to the generation of carbonic acid indicators
D. A dense yellow precipitate of calcium oxide separates out from the aqueous mixture
💡 Solution & Explanation
Passing carbon dioxide briefly through lime water produces an insoluble white precipitate of calcium carbonate that turns the solution milky, but prolonged bubbling converts this precipitate into soluble calcium bicarbonate, making the solution clear again. Carbon dioxide is a weakly acidic gas. Calcium hydroxide is commonly known as slaked lime.
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