Question

When I mix CO2 with Ca(OH)2, the solution will become milky, however, when I mix it with excess CO2, it become transparent again. What is the equation for the second reaction?

Answer 1

Tip1: What have you formed in the first reaction?
Tip2: What is the possible reaction between this product and CO2?

Answer 2

1) CaCO3
2) CaCO3+CO2+H2O->Ca(HCO3)2?

Answer 3

thank you very much!

Answer 4

Correct, but I would rather write:

\(CaCO_3+CO_2+H_2O-> Ca^{2+}_{\,(aq)} + 2 HCO^-_{3\,(aq)}\)

Because there is no solid calcium hydrogencarbonate in the solution.