Im working on the electrochemical chararacterization of cobalt oxide and i would like to know if Co(OH)2 converts to CoO or Co2O3 or Co3O4 or if it can can convert to all three phases and in that case which one comes first.
This is a question about the Pourbaix diagram of Co. This is a very complex question, which is not completely resolved.
i think Cobalt (II) oxide, solid can be prepared by heating cobalt (II) carbonate or cobalt (II) nitrate in the absence of air ( in the presence of air it can take up oxygen, forming Co3O4 which contains both Co II and Co III)
and Cobalt (II) hydroxide, can be precipitated as blue solid by adding sodium hydroxide solution to a solution of a cobalt (II) salt:
but your question need more investigation.
Dear Rania A. Nuamah please find attached a potentially useful article in which this conversion of cobalt(II) hydroxide is addressed. The paper is entitles "Characterization of Cobalt Oxides Transformations with Temperature at Different Atmospheres". The full text f this article if freely available on the internet.
Also please see the following interesting discussion about this topic:
http://www.sciencemadness.org/talk/viewthread.php?tid=23179
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