3 g of sodium carbonate, Na_2 CO_3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar…

$\displaystyle 3$ g of sodium carbonate, $\displaystyle \mathrm{Na}_2 \mathrm{CO}_3$ is dissolved in enough water to make $\displaystyle 250$ mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, $\displaystyle \mathrm{Na}^{+}$and carbonate ions, $\displaystyle \mathrm{CO}_3{ }^{2-}$ are respectively (Molar mass of $\displaystyle \mathrm{Na}_2 \mathrm{CO}_3=106 \mathrm{~g} \mathrm{~mol}^{-1}$ )