Date: 25 Nov, 2004 Objective: 1. To standardize sodium thiosulphate for titration use. 2. To find out the concentration of Vitamin C in the tablet. Theory: This experiment involves titration of redox reaction. Redox reaction means reduction and oxidation. In which oxidizing agent and reducing agent are mixed and oxidize/reduce each other. One losses electron(s) and increase in oxidation number when is oxidized, and vice versa. In order to find out concentration of the ascorbic acid in …showed first 75 words of 1400 total…

…showed last 75 words of 1400 total…the mass stated in the package : 240mg, it is 9.62mg less than it is supposed to be. However, not every tablet in the package is identical, e.g. weight of different tablet is different, an error of 9.62mg should be acceptable. Conclusion: 1.We standardized Na2S2O3 and its concentration is found out to be 0.0982M 2.We found out the concentration of vitamin C in the tablet, which is 230.38mg/tablet. Percentage by mass is 28.1%.