I think that both copper oxides may arise in burning the copper-ibuprofenate complex at 1200 oC. It depends on concentration of oxigen in the owen or in flame. Under almost reducing conditions /lack of oxigen/ in the owen or in the flame, the main product of such an incineration will be mostly Cu2O with admixture of smaller amounts of free Cu and CuO.
In the presence of marked excess of O2 in the owen /or in flame/ in the chamber, the main product should be exclusively CuO.
thank you prof/Rastislav SOLÁR
this mean that the copper - ibuprofenate complex converted finally into CuO by thermal analysis at 1200 oC in air atmosphere ?, and we can determine the Copper % in the complex ???
You have to oxidise the residuum after annealing /incineration/. Let the Pt or china crucible cool to room temp. Then put it into the cold owen, add a few drops of 64 % HNO3 till the residuum soaks the liquid and switch the owen set on the temp. of 400 -500 oC. Leave it in an owen for 30 - 45 min at this temperature. Then place the crucible /-s/ in dessicator over P2O5, or 98 % H2SO4, for 1 - 2h. Weigh the crucible and determine the amount of CuO as a difference between crucible with CuO and empty crucible.
Calculate the amount of Cu from amount of determined CuO. If you know weight of copper-ipubruphene you can easily calculate % of Cu in the complex.
Instead of gravimetry you can determine Cu also via colorimetry, comlexometry......
Note: this step is to be done to remove traces of carbon, and convert traces of Cu and Cu2O present in the residuum on CuO. The reason: transport of O2 under cinditions of annealing the sample in crucible placed into the owen at 1200 oC may be much limited.
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