The volumes between successive equivalence points in the titration of a polyprotic acid are theoretically equal. Consider again the titration of citric acid (H3C6H5O7) as in question 1 of the Pre-laboratory Questions where a titration required 15.3 mL of 0.180 M NaOH to reach the first equivalence point. How many mL of this base would be required so that the titration solution was essentially a solution of sodium citrate (Na3C6H5O7)?