A 0.1967 g sample of pure ascorbic acid is weighed out and dissolved in 50 mL of distilled water in an Erlenmeyer flask. One week later, when one third of the water in the flask has evaporated, this solution is titrated against 0.01735 M KI03 solution and requires 18.75 mL of it to reach the end point.
a. What mass of ascorbic acid has been oxidized by one of the components of air over the weeklong waiting period?
b. What has happened to the concentration of ascorbic acid in the solution in the flask over this waiting period (before the titration.)? Show your calculations.