on the Arnmonia'Cohall Bases. 91 



)» 



CHLORPLATIXATE OF XiNJS'THOCOBALT. 



This salt is easily prepared by direct combination. It has a 

 fine orange-yellow color, and is with ^difficulty soluble both in 

 hot and cold water, but it may be re-crystallized from a hot solu- 

 tion in dilute chlorhydric acia. It is represented by the formula 



NO 



as 



0-6830 grs. gave 01421 grs. chlorid of cobalt :^ 9*45 per cent cobalt. 

 0*6830 grs. gave 02187 grs. platmuni = 3202 per cent 



The formula requires 



Eqa. Calculated. Found, 



Cobalt, . - . 2 9-52 9-45 



Platinum, - " - 3 31-87 3202 



The analysis was made in this case by gently igniting the salt 

 in a platinum crucible, and afterwards dissolving out the chlorid 

 of cobalt by long boiling with chlorhydric acid, 



CHLOKHYDRAKGYRATE OF XANTHOCOBALT. 



This salt is formed by adding a cold solution of chlorid of 

 mercury to a solution of the chlorid of Xanthocobalt. It is usu- 

 ually thrown down in the form of brilliant pale brownish-yel- 

 low talcose scaler, which on re-solution in hot water containing 

 a little free chlorhj^dric acid, separate as the solution cools in 

 brown-yellow needles. The two forms appear to have the same 

 chemical constitution. The salt is quite insoluble in cold, and 

 with difficulty soluble in hot water, but the solution occurs with- 

 out sensible decomposition. The chlorhydrargyrate of Xantho- 

 cobalt has the formula 



N0..51SrH3.Co.O, Cla+4HgCl+2HO, 

 as the analyses satisfactorily show: 



0'7025 grs. gave 0'1375 grg. sulphate of cobalt = 7'44 per cent cobalt, 

 0-8898 grs. gave 0"9377 grs. chlorid of silver «= 26'06 per cent chlorine* 



The formula requires 



Cobalt, - - - « 



Chlorine, - - 6 



FERROCYAmD OF X^VNTHOCOBALT. 



This salt is precipitated almost immediately when a solution 

 of ferrocyanid of potassium is added to one of the nitrate of 

 Xanthocobalt. We have not been able to obtain it, however, 

 either from the chlorid or the sulphate, with which the ferrocy- 

 anid of potassium gives only turoid solutions. The salt is pre- 

 cipitated in prismatic crystals which appear to belong to the 

 oblique rhombic system. Its color is a very beautiful bright 



CalcnlatctiU 



Fotind. 



7-25 



7-44 



2619 



2605 



