Problem of back titraion

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karen0324
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Problem of back titraion

The titration of iodine and vitamin C is done.
The mass of vitamin C tablet calculated is slightly greater than the actual value, however, since the content of vitamin C tablet contains other minerals, the amount of absorbic acid should be smaller than the actual value.
What are the possible errors?
How can we modify accuracy, improve the purity of the vitamin C tablet?
Thx~