16 URANIUM, ANTIMONY, CHROMIUM, c . 



parts, equivalent to 0*6149 sulphuric acid. The 

 filtered liquid was mixed with caustic ammonia 

 to get rid of the peroxide of uranium ; sulphuric 

 acid was then added, partly to separate any ba- 

 rytes which it might contain, and partly to sa- 

 turate the potash. The liquid was then evapo- 

 rated to dryness, and being heated to redness 

 to drive off the ammoniacal salt, there remained 

 0*533 parts of pure sulphate of potash, equiva- 

 lent to 0-2907 potash. Thus he obtained the 

 sulphuric acid and the potash in the salt, and he 

 concluded that the deficit of weight was peroxide 

 of uranium. The constituents of the salt then are 



Sulphuric acid . 0-6149 or 28-311 

 Potash . . 0-2907 - 13-384 



Peroxide of uranium 1-2664 - 58-305 



2-1720 100 



Now, 13*384 potash are saturated by 11 '1,53 of 

 sulphuric acid. There remain 17*158 of sul- 

 phuric acid, which in the salt must have been 

 united with 58*305 of peroxide of uranium. 



M. Arfwedson having obtained this result, 

 calculates the quantity of oxygen in the 58*305 

 parts of peroxide of uranium from a canon of 

 Berzelius; namely, that 100 parts of sulphuric 

 acid saturate a quantity of basis containing 20 

 parts of oxygen. From this canon it is obvious, 

 that 17*158 parts of sulphuric acid must saturate 

 a quantity of basis containing 3*4316 oxygen. 



16 



