Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

How does elemental bromine oxidize the iodide ion?

1 Answer

Nov 22, 2016

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

$B r_{2} (a q) + 2 N a I (a q) \to I_{2} (s) + 2 N a B r (a q)$ $Br_2(aq) + 2NaI(aq) rarr I_2(s) + 2NaBr(aq)$

Explanation:

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

$I_{2} (s) + 2 S_{2} O_{3}^{2 -} \to S_{4} O_{6}^{2 -} + 2 I^{-}$ $I_2(s) + 2S_2O_3^(2-)rarrS_4O_6^(2-) + 2I^-$

Related questions

See all questions in Chemical Reactions and Equations

Impact of this question

1792 views around the world

You can reuse this answer
Creative Commons License