Lime mortar is prepared from quicklime, water and sand. As time passes, lime mortar turns into a considerably harder substance. Both fresh and old lime mortar react with aqueous hydrochloric acid, but only the old lime mortar effervesces during the reaction. Which equation represents the change from fresh to old lime mortar?
- A$\text{CaO} + \text{CO}_2 \rightarrow \text{CaCO}_3$
- B$\text{CaO} + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2$
- C$\text{Ca(OH)}_2 \rightarrow \text{CaO} + \text{H}_2\text{O}$
- D$\text{Ca(OH)}_2 + \text{CO}_2 \rightarrow \text{CaCO}_3 + \text{H}_2\text{O}$