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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Why can the milkiness of lime water decrease when excess carbon dioxide is passed?

Answer and explanation

Correct answer: Soluble calcium hydrogen carbonate forms

When carbon dioxide is first passed through lime water, insoluble calcium carbonate forms and makes the solution milky: Ca(OH)2 + CO2 → CaCO3 + H2O. If excess CO2 is passed, the calcium carbonate reacts further with carbon dioxide and water to form soluble calcium hydrogen carbonate: CaCO3 + CO2 + H2O → Ca(HCO3)2. Because the precipitate dissolves, the milkiness decreases. The other options do not explain this observation.

Related tags

Lime WaterExcess Carbon DioxideCalcium Hydrogen CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
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