Solid calcium carbonate is in equilibrium as described below: Ca2+(aq) + 2HCO3 – (aq) ⇌ CaCO3(s) + C — Equilibrium Chemistry Question

Solid calcium carbonate is in equilibrium as described below:
Ca²⁺(aq) + 2HCO₃ – (aq) ⇌ CaCO₃(s) + CO₂(g) + H₂O(l)
If CO₂(g) is added to this system in a rigid container, which changes will take place?
I. Additional CaCO₃(s) will precipitate.
II. The pH will increase.