mintreina - 22-9-2015 at 03:42
When I pour a 3% H2O2 solution into a solution of tetraaminecopper ii sulfate, I observe great amount of bubbles fizzing out, releasing a lot of heat
as well. The deep blue colour of the copper solution turns reddish, with brown precipitate.
What is the reaction that is happening here?
byko3y - 22-9-2015 at 05:24
Fenton's reagent
Most likely ammonia is oxidized to some nitrogen oxides, which give the precipitate.
[Edited on 22-9-2015 by byko3y]
Velzee - 22-9-2015 at 10:53
@byko3y But where then, does Fe get introduced to the equation?
[Edited on 9/22/2015 by Velzee]
unionised - 22-9-2015 at 11:41
I wonder if this is one of those odd reactions where H2O2 acts as a reducing agent and converts Cu++ to Cu+
The red / brown colour might be Cu2O
Attempting to isolate the unknown compound
Velzee - 22-9-2015 at 12:29
No stoichiometric amounts were used:
1) I made a probably dilute solution of tetraaminecopper (ii) sulfate that looked similar to this, but far less(the greenish foam contains some of the
product):
http://i.imgur.com/nNQoSmi.jpg
2) In the midst of adding H2O2 to the TACS solution:
https://youtu.be/aJE0ZPjMEas
3) Filtering some of the foam(you will see that this foam is not always created):
http://i.imgur.com/W3wfyo7.jpg
What was left in the container:
http://i.imgur.com/moHXrLw.jpg
4) After adding H2O2 to the mixture until it had stopped fizzing a lot, I was left with a dark-colored, minorly fizzing (as a cup of soda) solution:
https://youtu.be/SgRv2z9q0oU
I will try to report back when/if the product becomes dry and/or when the solution has evaporated completely.
[Edited on 9/22/2015 by Velzee]