25.3 g of sodium carbonate, $\mathrm{N}{\mathrm{a}}_2\mathrm{C}{\mathrm{O}}_3$ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, $\mathrm{N}{\mathrm{a}}^{+}$ and carbonate ions, $\mathrm{C}{\mathrm{O}}_3^{2-}$ are respectively (Molar mass of $\mathrm{N}{\mathrm{a}}_2\mathrm{C}{\mathrm{O}}_3=\mathrm{106 }\mathrm{g}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$ )