[ @ J 
Of Tartar Vitriolate. 
MY firft care was to procure a pure vegetable alkali; with 
this view I burned a quantity of cream of tartar in a filver cru- 
cible, and after folution, filtration and evaporation, to drynefs in 
a red heat, I found the alkali to weigh 1523,5 grs. This | dif- 
folved in diftilled water, the whole then weighed 4570 grs. Of 
this folution I took 360 grs. which contain 120 of mild alkali, 
and faturated it with oil of vitriol carefully purified, whofe fpecific 
gravity was 1,565, and which by my table contains 61 per cent. 
ftandard acid; the quantity employed amounted to 130 gts. 
which contained 79 ftandard. The fixed air expelled amounted 
to 34ers. and therefore the quantity of real alkali was 
120--34=86 ers. The folution being turbid I diluted it with more 
water; when 3238 were added, its fp. gravity was 1,013, tempe- 
rature 60°, the whole weight was 360+130+3238—34=3694 grs. 
45 ers. of tartar vitriolate diffolved in 1017 of diftilled water 
had the fame fp. gravity, temperature 60°. Hence the proportion 
of falt in each folution was equal. But in this laft the quantity 
I 
of falt was then the quantity of falt in the former was 
23,6" 
3694. 156,52 ers. Now of thi ity only 86 Ikali, ther 
25,07 56,52 grs. Now or this quantity only were alkali, there- 
fore the remainder, viz. 70,5, were acid or acid and water. ‘The 
quantity of acid employed in the faturation contained 79 grs. 
ftandard, but the acid taken up amounted only to 70,5 grs. 
therefore 8,5 were rejected, and confequently were mere water, 
therefore the acid taken up is ftronger than ftandard ; and fince 
“g parts ftandard lofe 8,5 by union with pure vegetable alkali, 
100 
