Why, when gas is passed through a solution of lime water, turbidity first occurs, and then the suspension dissolves?

At the first stage, an insoluble salt is formed – calcium carbonate. With further passage of CO2, calcium bicarbonate with better solubility is formed.

Са(ОН)2 + СО2 = СаСО3 + Н2О

Са2+ + 2ОН + СО2 = СаСО3 + Н2О

СаСО3 + Н2О + СО2 = Са(НСО3)2

СаСО3 + Н2О + СО2 = Са2+ + 2НСО3

For the reactions indicated in Section 2, the reduced ionic equations coincide with the complete ones.




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