Intelligence and Miscellaneous Articles. 4.75 



Chloroniceate ofBarytes. — This salt is a white crystalline powder, 

 which is slightly soluble in water, but readily so in hot alcohol. It 

 is decdYnposed by heat, yielding a mixture of two hydrocarbons, one 

 solid, the other liquid ; and a coaly residue is formed. It appears 

 to be composed of — 



C2* 72 34-12 



H8 4 1-89 



CP 35 16-58 



O* 32 15-19 



Ba 68 32-22 



in 100-00 



Chloroniceate of Silver. — When prepared in the usual manner, in 

 alcoholic liquors, this salt is precipitated in the form of white flocculi, 

 which washing and drying convert into a crystalline powder. By 

 analysis it yielded — 



C24 72 28-68 



H8 4 1-59 



CP 35 13-94 



Ag 108 43-02 



O* 32 12-77 



^51 100-00 



Ann. de Chim. et de Phys., Avril 1849. 



ON THE REACTION OF SULPHATE OF POTASH AND SULPHATE 

 OF COPPER. BY M. J. PERSOZ. 



When a saturated solution of sulphate of potash containing some 

 sulphate of copper is made to boil, it becomes in a very short time 

 extremely acid, and yields a very dense precipitate, which adheres 

 to the bottom of the vessel, and causes so much bumping that it is 

 requisite to use a porcelain capsule. 



In the first experiment, 210 grms. of sulphate of potash were dis- 

 solved in 1*5 litre of water; and 150 grms. of sulphate of copper in 

 1*2 litre. 



These solutions, previously filtered, were mixed, and the solution 

 was kept boiling for an hour, and then suflFered to cool ; then having 

 poured off the acid liquor, and washed the triple salt formed till the 

 washings ceased to be acted upon by ferrocyanide of potassium, 

 the salt was pressed between folds of blotting-paper, and dried in a 

 stove at 212° F. This triple salt weighed 9-95 grms. 



The second experiment, made with the same proportions of the 

 salts, but with less water, yielded 27-25 grms. of triple salt. 



Lastly, a third experiment was performed, in which 210 grms. of 

 sulphate of potash were dissolved in 1-2 litre of hot water ; and when 

 made to boil, 155 grms. of crystallized sulphate of copper were added 

 in small portions to it, so as not to reduce the temperature. In a 

 quarter of an hour an abundant precipitate of the triple salt was 

 obtained, which, washed with cold water, expressed and dried by 

 the water-bath, weighed 56-7 grms. When the sulphate of potash 



