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I(2)+S(2)O(3)^(2-) to...

`I_(2)+S_(2)O_(3)^(2-) to`

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`I_(2)+underset("Thiosulphate ion")(2S_(2)O_(3)^(2-)) to underset("Tetrathionate ion")(S_(4)O_(6)^(2-))+2I^(-)`
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