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Question #90cea

1 Answer

Mar 2, 2016

Oxygen from the air oxidized (some of) the iodide ions back to iodine.

Explanation:

$4 I^{-} + O_{2} + 2 H_{2} O \to 2 I_{2} + 4 O H^{-}$ $4I^{-} + O_{2} + 2H_{2}O -> 2I_{2} + 4OH^{-}$

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