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Cobalt precipitation reactions

Hi guys
For the precipitation reactions that we have to know with complex ions, what does cobalt react with excess NaOH to form?
My understanding is that it forms [Co(NH3)6]2+ with excess NH3, but not sure what it would form with excess NaOH, or would it just be [Co(H2O)4(OH)2]

(I do OCR A Level chemistry btw)
Reply 1
You're correct it is [Co(H2O)4(OH)2], but it isn't on the syllabus for ORC A so you shouldn't need to know it :smile:
This should give information if you want it:

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