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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