Barium, Strontium, Calcium and Magnesium. 179 
Bromate of strontia in three parts; bromate of lime in 1-1 parts, 
and bromate of magnesia in 1:4 parts. 
XV. When chlorid of barium is formed by leading the vapor 
of hydrochloric acid over heated baryta, the decomposition is at- 
tended with the evolution of heat anda red light. The same 
phenomena occur in the similar production of chlorid of stron- 
ium. 
That of chlorid of calcium is attended with heat only. 
Chlorid of magnesium cannot be formed in this manner. 
XVI. The specific gravity of anhydrous chlorid of barium is 
37037, of chlorid of strontium 2°8033, of chlorid of calcium 
2-0401.+ | 
XVII. When heated in dry air, chlorids of barium, strontium 
and calcium become alkaline; while chlorid of magnesium re- 
mains unchanged. 
XVUL Crystallized chlorids of barium and strontium do not 
change upon exposure to the air. 
he chlorids of calcium and magnesium deliquesce rapidly 
upon exposure to the air. 
XIX. Chlorid of barium is soluble in from 8108-6885 parts 
of nit alcohol, of 99-3 per ct., and in 4875 parts of boiling al- 
coho 
Chlorid of strontium is soluble in from 116-4-111°6 parts of 
cold and in 262 parts of boiling alcohol of 99:3 per ct.t 
; XX. Chlorate of baryta requires four parts of water for its so- 
ution. - 
Chlorates of strontia, lime and magnesia deliquesce in the air. 
XI. Chlorate of baryta is insoluble in alcohol. 
Chlorates of strontia, lime and magnesia are soluble in alcohol. 
XIL Fluorid of barium is readily soluble in hydrochloric 
and nitric acids. 
Fluorid of calcium is slightly soluble in boiling acids, and 
fluorid of magnesium scarcely at all in cold or hot acids. : 
XXIII. Fluorid of barium is soluble in aqueous hydrofluoric 
acid ; fluorid of strontium less; fluorid of calcium a mere trace, 
and fluorid of magnesium not at all. ss 
XXIV. Nitrites of baryta and strontia do not change in air. 
Noseciees of lime and magnesia deliquesce upon exposure to 
e air.§ 
XY. Nitrate of baryta requires 20 parts of water at 0° for 
solution. Nitrate of strontia 5 parts of cold water. Nitrates of 
lime and magnesia deliquesce most rapidly in the air. 
XVI. Nitrates of baryta and strontia are not soluble in alco- 
hol. Nitrates of lime and magnesia are soluble. 
* Rammelsbere. Pogg. Ann., lii, 81. + Karsten. 
+ Fresenius, Licbign Ann., Bd. lix. 117-128. $ Mitscherlich. 
