Water from a river flowing through a chalk-rich farming region can include $\text{Ca}^{2+}$, $\text{Mg}^{2+}$, $\text{CO}_3^{2-}$, $\text{HCO}_3^{-}$, $\text{Cl}^-$ and $\text{NO}_3^{-}$ ions. At a water treatment plant, this water is purified by adding a measured amount of calcium hydroxide. What precipitate will form from the river water after calcium hydroxide has been added?
- A$\text{CaCl}_2$
- B$\text{CaCO}_3$
- C$\text{Ca(NO}_3\text{)}_2$
- D$\text{Mg(NO}_3\text{)}_2$