50 T. S. Hunt on Lime and Magnesia Salts. 
a nearly pure carbonate. A similar separation of the two bases 
is obtained when dilute solutions of neutral carbonate are sub- 
stituted for the bicarbonate of soda. These reactions are intel- 
ligible when it is considered that hydrous carbonate of magnesia 
at ordinary temperatures decomposes the soluble salts of lime 
with the separation of carbonate of lime. . This is true not only 
for the sulphate and chlorid, but also for the bicarbonate of 
lime (§ 6). 
§ 73. The jae ghee See recently precipitated carbonate of lime 
in the presence of an excess of carbonic acid and in water ho < 
ing alkaline and pa chlorids, were ree to present some 
teresting peculiarities. By adding solutions of bicarbonate ‘of 
soda to carbonated water holding ‘chlorids of caleium and mag- 
nesium, supersaturated solutions, opnipinnig at the ordinary 
temperature and pressure from 3°4 to 4:1 grams of carbonate 
of lime to the liter were readily ms _ These, however, at 
Pp 
carbonate ($ 3-7). This solubility of the carbonate of lime 
will be enna discussed in § 88. 
4, According to sufoge a _ of water saturated with 
carbonic ‘neil dissolves only 1:33 gr. of carbonate of magnesia; 
in presence of alkaline and earthy ablbeide I obtained, however, 
permanent solutions holding not less than 21-0 gr. to he liter, 
thus confirming the previous results of Bineau ($8). In §9 1 
have described the observations of this chemist and my own on 
the ae yor decomposition of solutions of the sesquicar- 
nate of magnesia, which after a time let fall in close vessels 
a prelate, of hydrat ted monocarbonate. 
