28 URANIUM, ANTIMONY, CHROMIUM, & c . 



1^ atom sulphuric acid 7-5 



1 atom peroxide of uranium 28 



35-5 



But in general the sulphuric acid was an in- 

 termediate quantity between 7*5 and 8*8 ; I 

 never came nearer 10 than in the analysis just 

 given. 



I conclude from these experiments, that sul- 

 phuric acid and peroxide of uranium are capable 

 of uniting in two proportions, forming a bisul- 

 phate and a sesquisulphate ; and that in general, 

 both of these salts are mixed together. 

 Analysis of 9. Pcroxalate of uranium. I dissolved 27 

 of uranium, grains of the crystals of oxalic acid in water, and 

 digested the solution over 127 '5 grains of per- 

 carbonate of uranium, till the liquid refused to 

 dissolve any more. The undissolved portion be- 

 ing separated, dried, and weighed, was found to 

 amount to 83*7 grains. Hence, the portion dis- 

 solved weighed 43 '8 grains. 



Twenty-seven grains of crystallized oxalic acid 

 contain 13%5 grains of oxalic acid, equivalent to 

 3 atoms of that acid. 127%5 grains of percarbo- 

 nate of uranium contain 84 grains peroxide of 

 uranium, likewise equivalent to 3 atoms. Now, 

 43-8 is very nearly the third of 127-5 ; hence, it 

 is obvious, that the solution was a teroxalate of 

 uranium, or a compound of 



