I tried to prepare chromium alum by ox-red reaction between K2Cr2O7 and ethanol in presence of H2SO4. The result is always a green liquid that dont crystallize. I have found that the reaction must happen at 10°C.
Why we must keep the temperature at 10 ° C when crystallizing chromium alum ?
Daniel Lundberg
Dear Safa,
If the temperature is too high, the degree of hydration for the complex varies and does not allow for proper crystallization.
regards,
Daniel
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Safa Ezzine
did you mean i will have hydroxyde ligands instead of hexaaqua ligands ?
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Daniel Lundberg
Dear Safa,
I found a page for you to read (see below). I hope this helps you in your future endeavours.
On the coordination chemistry of chromium(II):
regards,
Daniel
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