Starch reacts with iodine gives blue colour.then y,when adding iodised salt with rice is not giving any colour
Answer:
In iodized salt, Iodine is not in free form but it is in salt form.
First of all are u adding it to just rice or starch obtained from rice?
Second thing :if u r adding it to starch obtained from rice ,then sodium chloride of salt acts as a reducing agent and in presence of reducing agent blue color disappears because I3− ions break up into iodine and iodide.
while adding iodized salt , we are adding iodide ion & not the iodine molecule.
Iodised salt contains potassium iodate - KIO3, but not elemental iodine. So, starch present in rice does not form the blue coloured complex, as it does with elemental iodine.
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