When equal volumes of saturated barium hydroxide solution and calcium hydroxide solution are combined, a white precipitate, Y, is formed. The mixture is then filtered, and carbon dioxide is passed through the filtrate, giving a second white precipitate, Z. What are Y and Z?
- AY: $\text{Ba(OH)}_2$, Z: $\text{Ca(OH)}_2$
- BY: $\text{Ba(OH)}_2$, Z: $\text{CaCO}_3$
- CY: $\text{Ca(OH)}_2$, Z: $\text{BaCO}_3$
- DY: $\text{Ca(OH)}_2$, Z: $\text{Ba(OH)}_2$