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Analysis Of Commercial Vitamin C Tablets

Analysis of commercial vitamin C tablets

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Title: Analysis of commercial vitamin C tablets

Essay Details:

Subject: Science

Author:

Date: June 23, 2016

Level: University

Grade: A

Length: 7 / 1888

Essay text:

Brown iodine can be easily reduced by acidified ascorbic acid to form colourless iodide ion: < Equation I The excess iodine is then back titrated by standard sodium thiosulphate solution, by using a burette and starch solution (used as end point indicator) Similarly, iodine can also be decolourized by thiosulphate ion: 2S2O32- + I2 > S4O62- + 2I- < Equation II Any iodine present will react with starch to form a blue-black complex. However, when all available iodine has been reacted, the blue-black complex becomes colourless which signals the end-point. Hence, the mass of ascorbic acid reacted by iodine can be calculated...

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