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A student adds 50 mL of his potassium iodate solution to the vitamin C suspension. However,...

A student adds 50 mL of his potassium iodate solution to the vitamin C suspension. However, he does not see the expected color change. Supply at least three reasons for this observation.

This is a question in my Ascorbic Acid Content in Vitamin C Tablets via Iodometric Titration Lab and I want to be sure i'm correct.

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