Question

what happens when CO2 gas is passed through lime water and why does it disappear on passing access CO2

Answer 1

Explanation:

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Answer 2

Answer:

• When CO₂ gas is passed through lime water, it turns milky due to  formation of insoluble, white coloured calcium carbonate.

• The milkiness disappears on passing excess CO₂ due to formation of soluble calcium bicarbonate.

Explanation:

• When CO₂ is passed through lime water [ Ca(OH)₂ ], it turns milky due to the formation of Calcium carbonate, CaCO₃. calcium carbonate is white in colour and insoluble. It makes the appearance of lime water white and milky.

           Ca(OH)₂ + CO₂ ⇒ CaCO₃ + H₂O

     This reaction is used to detect the formation of CO₂ gas in a reaction.

• On passing excess CO₂, the milkiness disappears. This is due to formation of calcium bicarbonate, [ Ca(HCO₃)₂] which is colourless and soluble.

            CaCO₃ + H₂O + CO₂ ⇒ Ca(HCO₃)₂