The Amount Of Ascorbic Acid In A Saving Of Country Time Pen

Satisfactory Essays
In this experiment redox-based titrimetric analysis was used to determine the amount of ascorbic acid (Vitamin C) contained in a serving of lemonade. This was done to confirm the 100 percent recommended daily allowance claimed on the package for a serving of Country Time Lemonade. The titration method used was adding a thyodene indicator to the analyte (lemonade solution) there is a visible colour change when the endpoint of the reaction between the titrant (KIO3) and the analyte occurs. The following reactions show how this titration method is viable. (Draw in reactions) KIO3 first reduced with iodide (I-) to generate iodine (I2 ) which then oxidized the ascorbic acid within the lemonade. Once all the ascorbic acid had reacted any iodine…show more content…
The titration worked well and yielded decent results. It was found that 72.10 mg of ascorbic acid is contained within a serving of lemonade.The %w/w of ascorbic acid is .30%. The volumes collected and observations made worked out to give proper and expected values. Rinsing the burette and pipette was important to this as it removed any water or dust inside. This meant that final volumes and calculations were more precise as there were fewer sources of error. The standard deviation obtained from the four trials was 0.22 mL. Much of this error is due to the rapid colour change. This made it difficult to precisely end the titration when the endpoint was reached. Another source of error is found in the assumption that because a colour change happened the proper reaction had occurred. This assumption while very basic and small potentially had a slight impact on final results. Titrations are very simple and therefore are empirical, and based off simple measurements with these simple assumptions accuracy decreases and error…show more content…
Comparing the experimentally determined 72.10 mg of ascorbic acid in lemonade to the RDA values found on the Health Canada website, for both males and females 19-30 years old one serving of lemonade was not enough to meet the RDA’s 90 mg and 75 mg respectively. However, the RDA for children 4-8 years old was 25 mg, which a serving of lemonade easily met and exceeded. This was as expected, while the literature values found on the package don’t necessarily match up to the experimentally determined values it was not far off. And considering it would be impossible to have 100% RDA for every age group in a single serving the results make sense. The experimental percent RDA’s for children 4-8 women 19-30 and men 19-30, are respectively 288%,96.1% and 80.1% Since the discrepancies between the theoretical (100%) and experimental values are relatively small for the ages 19-30 while for the children the discrepancy is rather large it shows that perhaps the company combined the three demographics into one via an
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