A 5.00 mL sample of filtered orange juice was treated with 50.00 mL of 0.01023 M I3 – to oxidize ascorbic acid to dehydroascorbic acid. After the oxidation was complete, excess I3 – was back-titrated with 13.82 mL of 0.07203 M Na2 S2O3 to starch indicator end point. What is the concentration of ascorbic acid in the orange juice? Report the concentration ascorbic acid in mg/100 mL.  C6H8O6 + I3 – → C6H6O6 + 3I - + 2H+  I3 – + 2S2O3 2- → S4O6 2- + 3I2  Answer: 48.5  mg/100 mL

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Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.