Science
When excess of carbon dioxide is passed through lime water, the milkiness disappears because
options
- Water soluble calcium carbonate converts to water soluble calcium bicarbonate.
- Insoluble calcium carbonate converts to water soluble calcium bicarbonate.
- Water soluble calcium carbonate converts to insoluble calcium bicarbonate.
- Insoluble calcium carbonate converts to insoluble calcium bicarbonate.
Acids Bases Salts
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Answer
Insoluble calcium carbonate converts to water soluble calcium bicarbonate.
Reason — When carbon dioxide (CO2) is first passed through lime water (Ca(OH)2), it reacts to form calcium carbonate (CaCO3), which is insoluble in water and gives milkiness to the solution.
Ca(OH)2 + CO2 → CaCO3(↓) + H2O
However, when excess CO2 is passed, the freshly formed calcium carbonate reacts further with carbon dioxide and water to form calcium bicarbonate (Ca(HCO3)2), which is soluble in water. The dissolution of this product causes the milkiness to disappear.
CaCO3 + CO2 + H2O → Ca(HCO3)2
Thus, the milkiness disappears because insoluble calcium carbonate gets converted into water-soluble calcium bicarbonate.
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