Identical masses of a solid, X, are added one after another to an aqueous solution, Y. After each addition, the pH of the solution is measured until the pH reaches $7$. The results are plotted as shown. What are X and Y?
- A$\text{Cu(s)}$ and $\text{HCl(aq)}$
- B$\text{Mg(s)}$ and $\text{HCl(aq)}$
- C$\text{NH}_4\text{Cl(s)}$ and $\text{NaOH(aq)}$
- D$\text{Zn(OH)}_2\text{(s)}$ and $\text{NaOH(aq)}$