lab 12 - same titration as in part I, except only after we...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Elizabeth Farrington Experiment 12 Discussion The purpose of this lab was to show that Vitamin C is oxidized by iodine. And to find if cooking Vitamin C degrades the Vitamin C. The purpose was to also find the Vitamin C content in tablets. In part I we found the molar mass of ascorbic acid by titrating a certain amount of ascorbic acid with potassium iodide, and finding the moles needed, then calculating the molar mass. We used starch as an indicator for all three parts. We also added HCl to mix with the ascorbic acid. IO 3 - +5I - +6H + →3I 2 +3H 2 O We found the molar mass to be 174.0g/n and 168.8g/n. The actual molar mass of ascorbic acid is 176.14g/n. For part II we found the amount of ascorbic acid lost if it is heated. We did the
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: same titration as in part I, except only after we heated the ascorbic acid and DI water solution. We found the amount lost to be .009g and .004g. In part III we found the percent ascorbic acid in Vitamin C tablets by again titrating the tablets with potassium iodide. From the weight of the tablet versus the weight calculated of ascorbic acid in the tablet, we found the percents in two tablets to be 84.4% and 84.0%. Errors could be attributed to over heating the ascorbic acid in part II and evaporating all the water. Using different scales to weigh each item might have affected the results. A slight error could be attributed to not quite accurate measurements made....
View Full Document

This note was uploaded on 05/03/2008 for the course CHEM 1BL taught by Professor Davis during the Winter '08 term at UCSB.

Page1 / 2

lab 12 - same titration as in part I, except only after we...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online