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d4diddy

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d4diddy

Re: paige post# 15694

Tuesday, 10/31/2006 1:55:43 PM

Tuesday, October 31, 2006 1:55:43 PM

Post# of 45771
Starch is used as an indicator in idometric titrations. The Iodide [I3(-)] forms a complex with starch which has an intense purple-blue color.

Instead of a potato, take a spray bottle filled with a solution of corn starch and spray it on the surface being tested. A purple color is a positive test for the presents of the iodide ion. Ironing starch will work fine.

Warning: Difficult to use if the house is painted purple.
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