Question

what happens when lime water is treated with co²​

Answer 1

Answer:

When lime water is treated with CO²​, two result come:-

(i) When CO²​ is passed through lime water for a short duration, it turns lime water milky due to the formation of a white precipitate of calcium carbonate.

Ca(OH) ²  +CO²​   → CaCO3  +H2O  

                                    (White ppt)

(ii) When excess of carbon dioxide gas is passed through lime water then the white precipitate calcium carbonate formed first dissolves due to the formation of a soluble salt calcium hydrogen carbonate Ca(HCO3 )2 , and the solution becomes clear again.

CaCO3  +CO²​  +H2O → Ca(HCO3 )2   (Soluble)

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