Question

why does the color of a liquid made from vitaminc,hydrogen peroxide,liquid loundry starch turns blue when we add iodine to it?

Answer 1

Question #49152, Chemistry, Inorganic Chemistry

why does the color of a liquid made from vitaminc,hydrogen peroxide,liquid laundry starch turns blue when we add iodine to it?

Answer:

By reacting iodine with vitamin C (ascorbic acid) occurs redox reaction in which iodine oxidizes the double bond in the acid molecule. By the reaction the iodide ion is formed, which is a colorless aqueous solution.

The interaction of hydrogen peroxide with iodine, iodine is oxidised to +5 oxidation state.

$$\mathrm{H_2O_2} + \mathrm{I_2} = \mathrm{HIO_3} + \mathrm{H_2O}$$

$\mathrm{HIO_3}$ is colorless acid.

In a solution of starch iodine gives a blue color because clathrate formed as a result of which the bond in a molecule of iodine lengthened from $0.267\,\mathrm{nm} \rightarrow 0.306\,\mathrm{nm}$.

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