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...