i have cobalt nitrate in my lab but i need cobalt chloride so how to convert cobalt nitrate to cobalt chloride?
No doubt, Co(NO3)2 can react with conc. HCl to give CoCl2 but there is always a possibility of formation complex[ CoCl4]^2- .
So it is indirectly prepared as:
Heat strongly to form CoO:
2Co(NO3)2-------- 2CoO+4 NO2+ O2
Both NO2 and O2 being gases will leave
Some of CoO may ger oxidize to Co2O3
4CoO+O2--------- 2Co2O3
and we get a mixture as:
CoO+Co2O3---- Co3O4
But both will react to give CoCl2 :
2CoO+Cl2------- CoCl2+O2
Co3O4+ Cl2------ 3CoCl2 +2O2[ 400-600C]
In fact, the preparation of anhydrous CoCl2 from Co3O4 is one of the best method reported in the literature.
REFERENCE:
Russian Journal of Inorganic Chemistry
December 2007, Volume 52, Issue 12, pp 1840-1843.
by intermediate formation of Co(OH)2, which can be separated from solution, washed with distilled ater then trated with the stoechiometrically amount of HCl. Evaporation followed by drying
More simple way: thermal nitrite decomposition to CoO, then reaction with HCl.
The abovementioned methods can be used, however, filtration of Co(OH)2 is slow due to peptization and CoO reactivity is small enough toward acids, this is a long process to dissolve the heat-treated CoO. The simplest way is reacting Co-nitrate solution with sodium carbonate to prepare CoCO3 (or basic carbonate), which can be filtered much easier as hydroxide, and dissolve in HCl immediately.
Calcinate the nitrate to produce CoO, then add concentrated HCl, warm a little bit and evaporate to dryness.
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