230 MR HENRY HOW ON CERTAIN SALTS AND 
As before mentioned, salts containing various amounts of water of crystalliza- 
tion are formed in more or less concentrated solutions. The crystals of that one 
whose analysis in the dry state is given, were in the form of groups of minute 
prisms. They were deposited in a tolerably dilute fluid, and lost five atoms of 
water in drying. 
{ 11-785 grains lost at 250° 
2-145 water. 
which number gives a per-centage of 18°20: 17:50, being that corresponding to 
the formula 
2 CaO, C,, H, O,, 2Ho+5 aq. 
By employing very dilute solutions, a salt was got in very well-defined, small, 
brilliant crystals, which lost, at 250° Fahr., 31:27 per cent. of water: now the 
number 31°82 is that required by the formula 
2 CaO, C,, H, O,, 2 Ho +11 aq. 
This dried salt gave 26°35 per cent. of lime, which agrees perfectly well with the 
results obtained in the former case. 
All these neutral salts are converted into basic compounds by simple ebulli- 
tion in water. 
Salts of Baryta with Comenie Acid. 
Carbonate of baryta is partially decomposed by comenic acid in the cold, and 
completely so when heated with an excess in water, the acid comenate of baryta 
being produced. On the other hand, when a mixture of the acid and an excess of 
carbonate of baryta is boiled with water, effervescence ensues, but the comenic 
acid remains undissolved, being in combination with the earth in form of a basic 
salt. I readily obtained both an acid and a neutral salt by double decomposition. 
Bicomenate of Baryta.—A cold saturated aqueous solution of bicomenate of 
ammonia gives, with a solution of chloride of barium, an immediate precipitate of 
a crystalline nature. With more dilute solutions, the salt appears more slowly 
in well-defined transparent rhombs. It is readily soluble in boiling water, and 
has a strong acid reaction. It loses its water of crystallization at 212°, but very 
slowly; the dried salt fuses on ignition. 
5°878 grains dried at 212° gave 
6-874 ... carbonic acid, and 
0-905... water. 
5-797 grains dried at 212° gave, on ignition, 
2:525 ... carbonate of baryta. 
Experiment. Calculation. 
—aSae__ eM 
Carbon, . . 31:89 32°19 Ce 42 
Hydrogen, - 1-71 1:34 H, 3 
Oxygen, . 3 Asp 32°21 0, 12 
Baryta, . ‘ 33°81 34:26 BaO 76°64 



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