2()2f NICKEL AND COBALT. 



By evaporation The folution being filterjid, appeared of a beautiful blue, 



and nickeUre "^ '^ ^'^^ ^'^^" evaporated at a gentle heat, by .which about two 



precipiutcd. drams of a bright green precipitate were obtained ; which 



proved to be oxide of nickel, united to oxide of cobalt. The 



fihered liquor being then afterwards evaporated at the heat of 



a ftove, depofited fiill an oxide of the fame quality. 



The faline mafs The faline mafs of ammoniacal nitrate of nickel, of a deep 



fofved^'^filtered'" S""^^" colour, which had been obtained by the evaporation, 



and boikd with was re-difToIved, filtered, and kept in ebullition with an ex- 



eaufticpotaih ^efs of cauftic polath, until the evaporation of the ammonia 



produces pure ' • 



uxide of nickel, was complealed, by means of which a dram and half of ox- 

 ide of nickel was feparated, which did not appear to contain 

 any more oxide of cobalt. 

 Sulphuric acid 2. As the feparation was not effeded very well nor with 

 *^'^ ' much facility by the former method, the effeft of fulphuric . 



acid was tried. For this purpofe, an equal quantity of water 

 was poured on the oxide obtained as before, and fulphuric 

 Gives an odour acid added till all was diflolved by the aid of heat. It then 

 acid*'"^'"^^ evidently gave out an odour fimilar to that of oximuriatic 

 acid, although there was not any muriatic acid ufed, A like 

 phenomenon, on a fimilar occafion, was before obferved by 

 the author (which is mentioned in the firfl fe6lion, page 18, 

 Treated with o£ Deitrage zur erweiterung, for 1799.) The folution was 

 ammonia dcpo. ^y^^^ treated with ammonia as before, until the whole was al- 

 ^ts oxide or ' ^ i i • i 



cobalt. nioft diflolved. The refidue, which was oxide of cobalt with. 



a little oxide of nickel, had the colour of verdigris. Wheq^. 



the folution was evaporated at a gradual fire, and feparated 



by filtration from the precipitate, of which the greateft part 



was oxide of cobalt, it was fubmitted to fpontaneous evapo- 



The folution ration : It then cryftalized without any farther feparation, 



eryftalifcd. partly into prifmatic cryrtals in groups, and of a green colour^ 



and partly into crufls united together, and blue at the edgqsj 



TheCTyftrfscon- the eflay of the oxides procured by potafli from the folution 



^fcker'"'^' ^""^ of the cry flals, as well as from the mother water, (hewed that 



they contained cobalt almoft in equal proportions. 

 The laft cxpc- 3. Mr. Bucholz repeated the former experiments on a larger 

 riment repeated f^-aje^ i„ hope to obtain a better cry ftallization, and operated 

 "on eight ounces of cobalt ore, from which the firft cryftals, of 

 a blueifli green, obtained by a procefs fimilar to that lafl re- 

 cited, and which weighed about five ounces, were again difr 

 fulved in 32 ounces of boiling water : This folutiqn was eva- 

 porated 



