Detection reaction for unsaturated fats (7) © Christian Herdt/Siemens Stiftung 2016 CC BY-SA 4.0 international

Detection reaction for unsaturated fats (7)

Image
Photo:
Reaction products without blue coloration (olive oil) on the left and with blue coloration (butter and iodine/starch complex) on the right.
English, German, Spanish
Image (149.8 kByte)
2017-07-11
Left: A lack of blue coloration means that an iodine/starch complex is not present. Therefore, the available iodine was taken up by unsaturated fats. Consequently, olive oil contains unsaturated fats.
Right: The presence of blue coloration (after about 3 minutes and after shaking) means that an iodine/starch complex has formed. Therefore, the available iodine was not taken up by unsaturated fats. Consequently, butter does not contain unsaturated fats.
Experiment; Illustration
Chemistry
Grade 7 to 9
Middle/high school
Chemical compound; Chemical reaction; Fats
Media portal of the Siemens Stiftung
Christian Herdt
© Christian Herdt/Siemens Stiftung 2016