An aqueous solution contains a salt, Y. When an aqueous solution X is added, a precipitate forms, and it dissolves again if more X is added. Which solution X and salt Y could this be?
- A$\text{HCl(aq)}$ and $\text{AgNO}_3$
- B$\text{H}_2\text{SO}_4\text{(aq)}$ and $\text{Ba(NO}_3)_2$
- C$\text{NaOH(aq)}$ and $\text{CuSO}_4$
- D$\text{NaOH(aq)}$ and $\text{ZnSO}_4$