218 AN ANALYSIS 
nate of soda. It was also to be presumed, that there would be 
mixed with it any sulphate or carbonate of lime deposited du- 
ting the evaporation. It was therefore re-dissolved in water. 
There remained undissolved a residue, which, when thorough- 
ly dried, weighed 22.6 grains. The salt was again procured 
by evaporation, but it was still not perfectly pure. Its dilute 
solution gave a milkiness with carbonate of soda; and oxalate 
of ammonia and muriate of barytes rendered it turbid, indica- 
ting the presence either of a little muriate of lime with sul- 
phate of soda, or magnesia, or of sulphate of lime with a por- 
tion of sulphate or muriate of magnesia. ‘The whole was re- 
dissolved in distilled water, a powder similar in appearance to 
the insoluble residue of the former solution, remained undis- 
solved, which, when thoroughly dried, weighed 10.3 grains. 
To the clear solution a portion of alcohol was added, not suffi- 
cient to cause any precipitation of muriate of soda; it produ- 
ced a slight turbid appearance, and after some hours a powder 
had subsided, which, after being washed with water, was 
tasteless : it weighed 1.5 grains. The muriate of soda, obtain- 
ed by evaporation, weighed, when dried, 718 grains. Being 
still not entirely pure, it was reserved for another operation. 
E. The insoluble residues collected in. the preceding opera- 
tions being put together, were submitted to the action of alco- 
hol, acidulated with muriatic acid, to remove any carbonate of 
lime, or of magnesia. Effervescence was excited ; the liquor 
being poured off, and the insoluble residue of sulphate of lime 
being washed with a little water, weighed, after exposure to a 
heat nearly equal to ignition, 26.3 grains. The alcoholic so- 
lution, with the addition of the small portion of water with 
which the sulphate of lime had been washed, afforded, by eva- 
poration, a matter which entered readily into fusion, and 
which, treated with sulphuric acid, gave 5.6 of sulphate, equi- 
valent 
