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What happen to the concentration of iodine when the pH is between 6 and 8?

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+1 vote
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What happen to the concentration of iodine when the pH is between 6 and 8?

(a) I2 decreases whereas HIO increases

(b) I2 increases, whereas HIO decreases

(c) Both I2 and HIO increases

(d) Both I2 and HIO decreases

This question was addressed to me in final exam.

This question is from Iodine, Bromine and Ozone Treatment topic in division Properties of Disinfection of Environmental Engineering

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Correct option is (a) I2 decreases whereas HIO increases

Easiest explanation: 3HIO + 2OH^– <=> HIO3 + 2 H2O + 2 I^–. When the pH is between 6 and 8, the percentage of iodine as I2 decreases while the percentage of iodine as HIO is increased.

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