How does elemental bromine oxidize the iodide ion?

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1 Answer
anor277
Nov 22, 2016

Elemental bromine is reduced by iodide ion according to the following reaction:

#Br_2(aq) + 2NaI(aq) rarr I_2(s) + 2NaBr(aq)#

Explanation:

The amount of iodine formed can sometimes be determined by back-titration with sodium thiosulfate:

#I_2(s) + 2S_2O_3^(2-)rarrS_4O_6^(2-) + 2I^-#

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