You perform a titration between Sodium hydroxide (NaOH) and nitric acid (HNO3). The NaOH is in the burette and the HNO3 is in the Erlenmeyer Flask. 35.8 mL of 0.50 M NaOH was added to 26.2 mL of HNO3, what is the concentration of the HNO3? Give your answer to 2 decimal places.