A saturated $\mathrm{CaCO}_{3}$ stock solution is existing at $25^{\circ} \mathrm{C}$. In one experiment $\text{(i)}$ $25 \mathrm{~g}$ $\mathrm{Na}_{2} \mathrm{CO}_{3}$ is added to the stock solution. In another experiment $\text{(ii)}$ $25 \mathrm{~g} \mathrm{Na}_{2} \mathrm{SO}_{4}$ is added to the stock solution. Select the correct statement from the following.
- Addition of $\text{(i)}$ increases the concentration of $\mathrm{Ca}^{2+}$ and addition of $\text{(ii)}$ decreases the concentration of $\mathrm{Ca}^{2+}$
- Addition of $\text{(i)}$ decreases the concentration of $\mathrm{Ca}^{2+}$ and addition of $\text{(ii)}$ increases the concentration of $\mathrm{Ca}^{2+}$
- Addition of $\text{(i)}$ and $\text{(ii)}$ increase the concentration of $\mathrm{Ca}^{2+}$
- Addition of $\text{(i)}$ and $\text{(ii)}$ decrease the concentration of $\mathrm{Ca}^{2+}$
