52 



RESEARCHES ON THE 



The formula requires 





Eqs. 





Calculated. 



Mean. 



Found. 



Cobalt 



2 



59 



22.52 



22.32 



22.34 



22.29 



Chlorine . 



2 



71 



21.09 



21.08 



26.94 



21.22 



Hydrogen 



. 16 



16 



6.10 



6.11 



6.18 



6.16 



Nitrogen . 



6 



84 



32.06 



31.90 



31.84 



31.91 



Oxygen . 



4 



32 



12.23 



12.53 



— 



— 



262 



100.00 



CHLORAURATE OF XANTHOCOBALT. 



This salt is readily formed by adding a solution of terchloride of gold to one 

 of the chloride of Xanthocobalt. Beautiful yellow needles are thrown down, 

 which may easily be purified by re-solution in hot water and crystallization. The 

 chloraurate of Xanthocobalt crystallizes in beautiful brown-yellow iridescent prisms, 

 which belong to the trimetric or right rhombic system, according to Prof. Dana's 

 measurements. The observed forms are co, l-oo , the only observed angle is 

 li : l£ = 130° 24' . I : I varies much and could not be accurately determined. 



The formula of this salt is 



N0 2 .5NH 3 .CoACl 2 +AuCl 3 +2HO. 



The data of the analysis are as follows : 



0.2681 grs. gave 0.1645 grs. metallic gold and sulphate of cobalt = 10.28 per cent, cobalt. 

 0.3028 grs. gave 0.1035 grs. metallic gold (reduced by SO a ) = 34.18 per cent. 

 0.2149 grs. gave 0.3461 grs. chloride of silver = 31.12 per cent, chlorine. 



The formula requires 



Eqs. Calculated. Pound. 



Cobalt . . 2 10.26 10.28 



Gold ... 1 34.28 34.18 



Chlorine . . 5 30.89 31.12 



CHLORPLATINATE OF XANTHOCOBALT. 



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 solution in dilute chlorhydric acid. It is represented by the 

 formula 



N0 2 .5NH 3 .Co 2 0,Cl 2 + 2PtCl 2 + 2HO 

 as the following analyses show : 



0.6830 grs. gave 0.1421 grs. chloride of cobalt = 9.45 per cent, cobalt. 

 0.6830 grs. gave 0.2181 grs. platinum = 32.02 per cent. 



The formula requires 



Eqs. Calculated. Found. 



• 2 9.52 9.45 



Cobalt 

 Platinum 



31.81 



32.02 



