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Analysis of commercial vitamin C tablets
Essay specific features
Written by:
Christopher H
Date added:
October 5, 2015
Level:
University
Grade:
A
No of pages / words:
7 / 1888
Was viewed:
5325 times
Rating of current essay:
Essay content:
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...
displayed 300 characters
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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.
Chemicals
vitamin C tablet(s), NaIO3, 1M NaI solution, 0.5M H2SO4, approximately 0.06M Na2S2O3, freshly prepared starch solution
Apparatus
electronic balance, beaker, volumetric apparatus, pipette, glass rod, white tile, dropper, measuring cylinder
Procedure
1...
displayed 300 characters
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