I am using Improved Hummer method.
Graphite: 1 gr
KMnO4: 6gr
H2SO4: 120ml
H3PO4: 13 ml
My mixture was on the stirrer for 12 hours (50 degree) and the color had turned to brown. I removed the stirrer and put the ice in it. The temperature went up. I waited till it went down. Then I added 3 ml H2O2 (30%) but the color turned to violet instead of yellow-brown. Why?
What should I do?
Is it possible if the reaction wasn't completed? That all KMnO4 hadn't reacted?
Hey,
After addition of H2O2, the GO solution colour should turn into yellow which determines that reaction is completed and graphite is converted into graphite oxide. If you add additional H2O2 means you are oxidizing the Mn species, present in the system and that is the reason behind the voilet colouration of the mixture.
Thank you so much for answering. Yes, I realized that all the KMnO4 hadn't reacted completely.
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