Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: jhernandezf on April 13, 2008, 03:58:16 PM
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Hi
I made a test to look for iodine in salt. I used one recommended by UNICEF : Salt becomes purple when lemon juice is mixed with it. Perfect, but I do not know why this occurs. Why lemon does that on salt.
Any help on this will be greatly appreciated
Thanks
Johanny
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Isn't iodine solid purple? Does this mean you're getting a deposition of iodine when you add lemon juice? Possibly a redox reaction?
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Is there starch present, in your sample or your test reagent salt? The iodine, is it free iodine (the brown or purplish-black crystals, with a lustrous almost metallic sheen) or is it a salt of iodine (can be white in color)?
*[EDIT]*
It appears you were performing a test, something like this one:
http://www.unicef.org/uzbekistan/reallives.html
but, some more specifics about your application are needed.