30 URANIUM, ANTIMONY, CHROMIUM, &c. 



(2.) The nitric acid solution was evaporated 

 to dryness, to get rid of the excess of acid the 

 dry mass re-dissolved in water, and precipitated 

 by ammonia. The precipitate, which was 

 orange, being collected on the filter, washed, 

 and dried, weighed 16*5 grains. Being exposed 

 to a red heat, it was reduced to protoxide of 

 uranium, and weighed 14 '04 grains ; equivalent 

 to 14*54 grains of peroxide of uranium. 



(3.) The residual liquid was evaporated to 

 dryness in a platinum cup, and exposed to a 

 heat gradually raised nearly to redness. The 

 nitrate of ammonia was decomposed and driven 

 off, and there remained 2*7 grains of nitrate of 

 potash, equivalent to 1*223 grain of potash. 



(4.) Thus the constituents of the salt were 



Peroxide of uranium 

 Potash 



Carbonic acid 

 Water 



19-000 



The carbonic acid was no doubt combined with 

 a portion of the peroxide of uranium, showing 

 that the carbonate had not been completely de- 

 composed. If we subtract the portion of per- 

 carbonate, amounting to rather less than 6J 

 grains, we shall find that the uraniate of potash 

 is a compound of 



