CHED 457 |
| The reaction of ascorbate ion with chlorite ion was investigated at basic pH and constant ionic strength. The disappearance of ascorbate ion was monitored by measuring the decrease in absorbance at 268 nm as a function of time. Phosphate and borate buffers were used. When using buffer solutions, addition of a small amount of EDT A decreased the rate, indicating metal ion catalysis due to metal ion impurities in the buffer. Buffer solutions were consequently prepared with small amounts of EDTA for this study. Rates of reaction were measured at different pHs and reactant concentrations. The rate was also investigated as a function of temperature and an Arrhenius plot was constructed. Quantitative analysis of oxalate ions produced by ascorbate oxidation was carried out using permanganate titration. The results were consistent with the kinetic studies, when the reaction was run in the absence of EDTA large amount of oxalate was produced. |
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Undergraduate Research Poster Session: Organic Chemistry
11:15 AM-1:15 PM, Monday, 14 March 2005 Convention Center -- Hall D, Poster
Division of Chemical Education |