Exercise# 1 Calculation of ascorbic acid in Vitamin C tablet: (i) Starch is used as an indicator: starch + I; → starch-I; complex (deep blue) (clear) (ii) Titrate ascorbic acid with I;: но он но но, + 31 + 211* + lj + H,0 HOl. HO, но ascorbic acid (FW 176.124) dehydroascorbic acid (FW 192,124) 1 mole ascorbic acid → 1 mole I; Standardization of Titrant Followed by Analysis of Unknown OStandardization: Suppose 29.41 mL of I;' solution is required to react with 0.1970 g of pure ascorbic acid, what is the Molarity of the I; solution? DAnalysis of Unknown: A vitamin C tablet containing ascorbic acid plus an inert binder was ground to a powder, and 0.4242g was titrated by 31.63 mL of I;. Find the weight percent of ascorbic acid in the tablet.

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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.