410 Foreign and Miscellaneous Intelligence. 



4 Chloride of Gold and Potassium crystallizes in square prisms and 

 rhombo-hedrons ; is of an orange colour, and very efflorescent in a dry 

 atmosphere ; at 212 F. they part with their water of crystallization, 

 but without losing any chlorine ; two grammes of the salt were found 

 to have lost 0.2125 gr. of water. On bringing the remainder in 

 contact with hydrogen gas at a gentle heat, the gold was reduced, 

 and 0.501 gr. of chlorine was found to have united with the 

 hydrogen: of the remainder, 0.3505 gr. of chloride of potassium 

 was dissolved, and .0936 gr. of gold was the residuum. If the 

 compound be considered as composed of one equivalent of chloride 

 of potassium (equal to one atom of chlorine and one of potassium), 

 and one of chloride of gold (equal to one atom of gold and three of 

 chlorine), the result of the analysis will be found pretty nearly to 

 correspond with that of calculation : 



By Analysis. By Calculation. 



Chloride of Potassium . 17.522 . . 17.566 



Gold 46.800 . . 46.827 



Chlorine 25.050 . . 25.014 



Water 10.625 . . 10.593 



c Chloride of Gold and Sodium crystallizes in orange-red prisms, 

 and cannot be freed from its water of crystallization without losing 

 its chlorine. On reducing it by hydrogen gas, the residue of 

 100 parts consisted of 14.466 of chloride of sodium, and 49.51 

 of gold. In order to determine the proportion of chlorine in the 

 compound, 3.026 grammes of the crystallized salt were mixed with 

 6 gr. of efflorescent carbonate of soda, and heated in a platina 

 vessel, until the compound was decomposed and the gold reduced, 

 which, when separated from the soluble salt, was found to weigh 

 1.4978 gr. : it formed, therefore, 49.497 per cent, of the com- 

 pound. The solution was saturated with nitric acid, and nitrate of 

 silver added to it ; the precipitate was 4.3347 gr. of chloride of silver, 

 which corresponds to 35.54 of chlorine in 100 parts of the salt. Of 

 this chlorine 8.835 must accordingly belong to 14.466 of the chloride 

 of sodium, and the remainder 26.501 to the gold; and if the com- 

 pound be considered as consisting of one equivalent of chloride of 

 gold (equal to one atom of gold and three atoms of chlorine), 

 one equivalent of chloride of sodium (equal to one atom of chlorine 

 and one of sodium), and four equivalents of water, the results of 

 analysis and calculation will correspond perfectly. 



By Analysis. By Calculation. ] 



Chlorine . . 8835 [ ,, Af . a 



Sodium . . 5631 j 14 ' 466 14 ' 68 



Chlorine . -265051 (26.575) 

 Gold . . . 49497/ 76>0(J ' ' ' \49.745J 76 ' 32 

 Water 9.532 9.00*' 



* Poggendorf'a Ann, der Pbysik und Chemie, 1830, p, 5 ( J7. 



