Chapter 16, Problem 99E

The equation for a reaction by which a solution of sodium carbonate may be standardized is ${\text{2HC}}_{\text{7}}{\text{H}}_{\text{5}}{\text{O}}_{\text{2}}+{\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}\to {\text{2NaC}}_{\text{7}}{\text{H}}_{\text{5}}{\text{O}}_{\text{2}}+{\text{H}}_{\text{2}}\text{O}+{\text{CO}}_{\text{2}}$. A student determines that $5.038\text{ g}$ of ${\text{HC}}_{\text{7}}{\text{H}}_{\text{5}}{\text{O}}_{\text{2}}$ uses $51.89\text{ mL}$ of sodium carbonate solution in the titration. Find the molarity of the sodium carbonate.