Hi Heather, I haven't used this method, but I assume the reaction is similar to the oxidation of ascorbic acid with I2 given here, with NBS replacing I2 as the oxidant. I'm assuming a 1:1 net stoichiometry of ascorbic acid with NBS, but even without the reaction details the amount of ascorbic acid can be calculated based on the standardization of your NBS solution by first titrating known amounts of ascorbic acid with it. From the endpoint volume of your NBS solution required for these, you can calculate the mg of ascorbic acid oxidized per mL of NBS solution, __ mg/mL. Once you have this, just multiply the volume of NBS solution needed to reach the end point with your unknown sample (13.93 mL) by this factor to obtain the mg of ascorbic acid in the sample:
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