in neat (no solvent) byproducts: Cl2, O2; heating CoCO3 to 245-250°C, adding under stirring gaseous BrF5, forcing temperature step by step to 400°C; no formation of OF2 and ClF;;
air in nitric acid
addn. of NH4NO3 to a soln. of CoCO3 in dild. HNO3; rendering ammoniacal; oxidn. by passing through a strong stream of air; addn. of concd. HNO3; pptn. of {Co2(O2)(NH3)10}(NO3)5; filtration; after cooling the filtrate {Co(NH3)5(NO3)}(NO3)2 precipitates;; evaporating the filtrate almost to dryness; the product precipitates; washing with dild. HNO3 to remove NH4NO3;;
