Detection reaction for unsaturated fats (3) © Christian Herdt/Siemens Stiftung 2016 CC BY-SA 4.0 international

Detection reaction for unsaturated fats (3)

Addition of soluble starch to butter (on the right). The starch serves as an indicator of “free iodine” through the formation of a blue iodine/starch complex.
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Note: The test tube must be shaken before the detection result can be evaluated.
Experiment; Illustration
Grade 7 to 9
Middle/high school
Chemical compound; Chemical reaction; Fats
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Christian Herdt
© Christian Herdt/Siemens Stiftung 2016