46 F. H. Storer on the Carbonates of Lime and Baryta. 
tirely analogous, in kind, to that of ammonia, although less in 
o demonstrate this it is only necessary to employ sufficiently | 
dilate solutions of the caustic alkalies and to pass throug! 
mixture a stream of carbonic acid gas diluted with air,—air ex- 
pired from lungs, for example,—when no immediate precipitate 
will be produced unless the solution be heated. Even if the so- 
lution of caustic ane e used in so concentrated a form (not 
sufficiently so however to precipitate a hydrate of the alkane 
tering and boiling the clear filtrate, — a copious precipi 
of carbonate of lime will be produced at once. This havior - 
is more marked with lime salts than with those of baryta, 
soda evidently exerts a greater influence than potash. 
If a solution of chlorid of sodium, of chlorid of potessliay on 
of chlorid of ammonium be added to the mixed solution before 
. carbonic acid gas the precipitation of the carbonate of 
or baryta is attended with still greater difficulty. 
Attention has been called by several hapa (among others _ 
a Pr Che, ii, 4405 Vogel, ibid., vi | 
Asa ae it has been pee, (Kolbe, loc, cit. ; Mohr, Te 
trirbuch, i, 110 and 113) that the solution should be boiled, in 
ontee to throw down all of the carbonate of lime. This would, | 
is true, in most cases cause the entire precipitation of the cat 
poe But it is possible, especially in the analysis of some 
i 
mineral waters, that alkaline salts may be present in sufficient 
quantity to prevent the procipuaie® of a portion of the carbon: | 
ate “i lime even on ebulliti 
be (Handwoerterbuch der Chem., 1 eaagen S, sts ——— er penasi 
of the pod ae of aca: of calcium or barium neutralize rie: < 
with a dilute solution of caustic soda or potash instead of ammo’ 
