90 Experiments on the Oxide and Salts of Uranium. 
acid = 1,32 grains: 30 grains of the above carbonate, heated 
to redness, until they ceased to lose weight, lost 3.4» grains. 
Hence it appears, that 30 grains of the above precipitated car- 
bonate consist of 
Oxide Gsi5d deve 426-6 
Acidcad colt a beceline 
Wrateren,, stay antsy, ci 
a quantity of carbonic acid infinitely too small to be considered 
as saturating the oxide. 
Another attempt was made to obtain a pure carbonate of 
uranium. A quantity of recently precipitated and moist oxide 
was diffused through water, and carbonic acid was passed 
through the mixture, by which the oxide was very soon entirely 
dissolved. This solution was gently heated, when it presently 
became turbid, and the precipitate being collected and dried at 
a very moderate heat, was of a dirty yellow colour, and per- 
fectly soluble, with slight effervescence, in muriatic and nitric 
acids. When, however, an attempt was made to collect the 
carbonic acid evolved, it did not amount to 1 cubical inch from 
30 grains; so that it may perhaps be concluded that there is no 
dry carbonate of uranium which can be regarded as a definite 
compound. 
VI. It has been stated above, that when oxide of uranium is 
boiled with dilute sulphuric acid, a yellow-green compound, of 
difficult solubility, is formed, which has there been termed a 
subsulphate; to determine its composition, 50 grains, carefully 
washed and dried, were dissolved in nitro-muriatic acid, and 
the solution decomposed by ammonia; the precipitated oxide of 
uranium having been separated upon a filter, the clear liquor 
was precipitated by muriate of baryta, and 29.5 grains of sul- 
phate of baryta, =10 of sulphuric acid, were obtained; hence 
the composition of the subsulphate is, 
Sulphuric acid . . 10. 
Oxnda 8 Ah yt 3 40. 
50. 
ana if we consider this as composed of 2 proportionals of oxide 
