- 
 Iitrate of Ros al 
by Te-crystallization. The salt may also be easily prepared from 
on the Ammonia-cobalt Bases. 
6NH:s.Coz03, 8S0s+6NH:3.Co2Cls. 
We have already mentioned, however, that the chlorid and 
sulphate of Luteocobalt are isomorphous, and we have accord- 
ingly found, as might be expected, that these two salts are capa- 
ble of crystallizing together in all proportions, and cannot be 
separated by crystallization alone. ‘I'o show the variation in the 
constitution of the mixed chlorid and sulphate, it will be suffi- 
Gent to give a few cobalt determinations made with the salt as 
prepared at different times. 
01510 grs. gave 00673 grs. sulphate of cobalt = 16°96 per cent cobalt. 
O'7075 grs. “ 0-8210 grs. %) FS UT 26. 9 ‘4 
01205 grs. “ 00680 grs..  « « Ventiat 4 - 
CHROMATE OF LUTEOCOBALT. 
A solution of the neutral chromate of potash gives a fine yel- 
low precipitate in solutions of the chlorid, nitrate, and sulphate 
of Luteocobalt. The precipitate is soluble in hot water, and 
crystallizes readily from the solution in brown-yellow crystals, 
Which resemble those of the sulphate. We have not analyzed 
this Salt, but it is almost certain that its true formula is 
f potash, as the precipitate from the chlorid always con- 
chlorine, and that from the sulphate, sulphuric acid. 
NITRATE OF LUTEOCOBALT. 
the chlorid or sulphate by double decomposition with nitrate of 
ay 
Midi 
