When determining the amount of an oxidant present by titration, you can use iodine and starch as an indicator.
First, the oxidant, like hypochlorite, oxidizes
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neutral iodine into iodide ion
iodide ion into neutral iodine
iodate polyatomic ion into iodide ion
When starch and iodine are both present, the solution is
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blue-black
brownish yellow
clear
During the titration, the titrant, like thiosulfate, reduces the
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iodide ion into iodate polyatomic ion
neutral iodine into iodide ion
iodide ion into neutral iodine
When the iodine has completely reacted at the endpoint of the titration, the solution should become
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clear
blue-black
brownish yellow
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When determining the amount of an oxidant present by titration, you can use iodine and starch as an...
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