1814.] Analysis of Aslestous Aci'mol'le. 211 



soda ley, and heated in a porcelain vessel, ir order to dissolve any 

 alumina which it might contain. The mattei by this treatment 

 assumed a much darker colour, and diminished consideiahi; in 

 bulk. The whole was now allowed to cool, and then ppured v\ on 

 a filter, and the matter which remained upon the filter wr.s suffi- 

 ciently edulcorated with water. 



The liquid which passed through the filter, being mixed with a 

 solution of sal ammoniac, became milky, and deposited the alu- 

 mina which it had dis>ulved. This alumina, being washed, d-iid, 

 and heated to redness, weighed 14.* I grains. 



6". The matter remaining on the filter had a reddish brown colour. 

 It was dissolved in very dilute sulphuric acid, the solution was 

 evaporated to dryness, and redissolved in distilled water. The 

 undissolved portion, being heated to redness, weighed 0*6 grain, 

 and was sulphate of lime, equivalent to - 25 lime. 



Suspecting that the liquid might still contain some sulphate of 

 lime, I evaporated it down till it became concentrated, and then 

 mixed it with a quantity of weak alcohol. A number of ncedie- 

 form crystals separated, which were sulphate of lime ; arid after 

 being washed and heated to redness, weighed 0*65 grain, equivalent 

 to 0*273 grain lime j so that the whole lime obtained amounted to 

 0-523 grain. 



7- The sulphuric acid liquid thus freed from lime was made as 

 neutral as possible by means of carbonate of ammonia, aim then 

 succinate of potash was chopped in as long as any precipitate fell. 

 The red precipitate thus obtained weighed, when dry, 2G-2 grains, 

 and was succinate of iron. Being exposed to a red heat in <■ plati- 

 num crucible, its weight was reduced to 8*375 grains, which was 

 red oxide of iron. 



8. The liquid, though thus freed from iron by succinate of 

 potash, wa< not quite limpid, hut had a dirty brownish yellow 

 tinge, which made me suspect that it still retained some iron in 

 solution, though succinate of potash had ceased to produce any 

 farther effect. On being mixed with carbonate of soda, and boiled, 

 a white precipitate fell, which, being heated to redness, weighed 

 4*1 grains. This precipitate was at ffist white, but be< a:ne darker 

 on drying, an 1 when heated to redness became reddish blown. It 

 w:^, therefore, principally manganese. 



9. To ascertain if it contained any magnesia, I digested it in 

 nitric acid, filtered the solution, evaporated it to dryness, and 

 digested the dry mass in distilled water. There remained undis- 

 solved - 2 grain of a reddish matter, which proved to be oxide of 

 iron. The aqueous solution, being mixed with carbonate of soda, 

 and heated, let fall a white precipitate, which weighed 0'3 grain, 

 and was magnesia. 



10. The liquid from which the manganese was precipitated had 

 a blue colour, and gave a red precipitate with prussiate of potash ; 

 therefore it contained copper. I supersaturated it with muriatic 



o 1* 



