How can I synthesis Co(OH)2 from solution whitout transformation to Co(OH)3 or other Co(III) hyderoxide componds?
Cobaltous salt like nitrate is treated with aq. NaOH and it forms cobaltous hydroxide at pH above 10.
In presence of open air it will be converted to Cobaltic ion. (III).Hence, Add NaOH solution dropwise in cobalt(II) nitrate solution in vaccum condition.
:-)
You can use the reagents (solutions of sodium or potassium hydroxides and a solution of cobalt(II) nitrate), which are blown by argon or nitrogen for total extraction of the oxygen.
I have isolated cobalt(II) phosphate in ammonia atmosphere. The synthesis was carried in dessicator with solid mixture KOH and NH4Cl at the bottom.
Hi,Cristian D. Ene , Thank you for your answer ,ِDo the precipitate (Co(OH)2) blue or rose red?can you send me G. Brauer's book. Thanks.
Precipitation reaction from aqueous solutions of Co(II) salt and NaOH. The solutions should be cooled to OoC. The water must be free of CO2 and oxygen; pH about 11.
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