35S ASTALYSIS OF IRON SPAS. 



IWaporated and The solution, on Several successive evaporations, afford- 

 ^ ^^ ^ ■ ed crystals of green sulphate. Only a few small scales of 

 sulphate of lime were formed. The last portions of liquor, 

 affording no more crystals, were added to the crystals that 

 had been separated, and the whole diluted with a quaiitity 

 of water more than sufficient for their complete solution. 

 Sulphuretted Water of sulphuretted hidrogen occasioned no precipitate 

 hidrogen added, j^ this solution; it merely destroyed its transparency, as is 

 the case in solutions of iron that contain but a small quantity 

 of red oxide. 

 Precipitated by The hidrosulphuret of ammbnia, afterward added, oc- 

 hidr^uJphiuet casioned a very copious black precipitate, which was sepa- 

 rated hy the filter, and washed in cold water. 

 Precipitate dis- The precipitate detached from the filter was treated with 

 Jegia.^ '" ^"^"^ aquaregia. I neglected to burn the filter, and treat the 

 ashes in the same way, which may have occasioned a little 

 Joss of the metallic principles; for this very fine precipitate 

 easily insinuates itself into the paper. 

 Solution de- The nitromuriatic solution diluted in water and filtered 



composed by ,^.^g decomposed by saturated carbonate of potash. The 

 potash. ferruginous sediment was redissolved, wh'le still wet, by 



weak acetic acid, and by successive evaporations the ace- 

 fate of iron was entirely decomposed. The sediment, col- 

 lected on a filter, was dried with a red heat, and weighed 

 188 cent. [29 grs.]. The colourless liquor, separated by 

 ihe filter, was decomposed by saturated carbonate of pot- 

 ash : it did not become turbid, and it was added to that, 

 which arose from the decomposition of the nitromuriatic 

 solution. I'rom this carbonate of manganese was soon 

 thrown down by boiling, which, when washed, and dried 

 at a red heat, was converted into brown oxide, and weighed 

 7 cent. [1-08 gr.]. 

 C^telate r,f am- The liquor separated from the metallic precipitate ob- 

 mcuija' a e . ^g^jpjpj jj^ ^j^g hidrosulphuret of ammonia M'as mixed with a 

 small quantity of oxalate of ammonia, which did not occa- 

 sion in it any sensible precipitation. On evaporating after- 

 ward, a white sediment formed, which was separated. This 

 sediment, heated in a small porcelain capsule, burned with a 

 blue flame, and left a residuum, which, after being heated 

 Tcd hot, was found to weigh 2 cent. [0*308 gr.]. It had 

 . ail the characters of lime. 



The 



