Ethanol oxidation, 3 of 3

Numéro d’image : 12635671
Ethanol oxidation, 3 of 3
Ethanol oxidation, 3 of 3. Oxidation of a primary alcohol (ethanol, C2H5OH) by potassium dichromate (VI) (K2Cr2O7). In the process chromium is reduced from +6 oxidation state to +3 oxidation state. This is physically observed as a colour change from orange to green to blue. Here 0.4 mL of 0.23M solution of potassium dichromate acidified with sulfuric acid (H2SO4) was added to a test tube with 6.5 mL of ethanol. The reaction rate was slow, Photo 1 was taken at the start, Photo 2 - after 30 min and Photo 3 - after 5 hours. A test tube with 0.25 M solution of potassium dichromate (VI) (left, orange) is included as a reference.
Licence : Droits gérés
Crédit: Science Photo Library / Giphotostock
Taille de l’image : 3370 px × 5096 px
Model Release : Non requis
Property Release : Non requis
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