Analysis of commercial vitamin C tablets

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Issue:

Science

 

Written by:

Christopher H

 

Date added:

October 5, 2015

 

Level:

University

 

Grade:

A

 

No of pages / words:

7 / 1888

 

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5263 times

 

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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...
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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...
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