Redox reaction, changing a solution from yellow to blue


by future_vet
Tags: blue, reaction, redox, solution, yellow
future_vet
future_vet is offline
#1
Nov9-06, 10:13 AM
P: 169
Hello,

Today, we saw an experiment where an unknown yellow solution became dark blue while it was being shaken.

I have an explanation for it, but would like your opinion as well:

We had a redox reaction, with the oxidation of glucose (being the reducing agent) by NaOH (being the oxidizing agent). The solution had methylene blue to speed up the reaction, causing the liquid to become blue upon shaking (the shaking increased the presence of oxygen, also speeding up the reaction).

Would that be a good answer, or am I missing something?

Thank you,

J.
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physics girl phd
physics girl phd is offline
#2
Nov9-06, 07:58 PM
physics girl phd's Avatar
P: 938
The methylene blue is being oxidized/reduced too...
looking up "methylene blue" or "blue bottle reaction" on www.google.com gave me this:

http://chemed.chem.purdue.edu/demos/...eets/19.1.html
future_vet
future_vet is offline
#3
Nov10-06, 07:47 AM
P: 169
Thank you!


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