Chenaibostates cc? 261 
sing bitartrate of soda with chlorate of potash, in the following man- 
ner:—seven parts by weight of crystallized carbonate of soda, and 74 
parts by weight of tartaric acid, are dissolved in twenty-four parts of 
boiling water, and to this boiling solution is added six parts by weight 
of chlorate of potash previously dissolved in sixteen parts of water 
likewise heated to 212° F., at the same time agitating the mixture. 
As soon as this is done, it is taken from the fire and. allowed to cool, in 
order that the bitartrate of potash formed may separate properly ; af- 
__ ter which it is poured on a double paper filter, and to the filtered liquid 
_ is.added a saturated solution of oxalic acid, consisting of. six parts by 
weight of oxalic acid, and eighteen parts of water heated to about 134° 
F.; the whole is then well agitated, and the vessel placed in an ordi- 
nary refrigerating mixture, for the better separation of the oxalate of 
soda, which is then entirely and easily removed by a simple filtration. 
This method is based upon the superior solubility of the @hlorate of 
‘Soda over the same salt of potash, and upon the sparing solubility of 
the oxalate of soda, The chloric acid thus. obtained:is, it is true, not 
_- absolutely pure, but still sufficiently so for most chemical and techni- 
cal purposes—for instance, for the preparation of chlorate of barytes, 
which is so much consumed in the manufacture of fire works. To ob- 
faina chemically pure and at the same time more: concentrated acid, 
; the solution above obtained should be treated with recently precipitated 
: ‘Carbonate of baryta, avoiding any rise of temperature; but the solu- 
_ ton of the barytic salt may now be evaporated over the fire, and the 
large beautifuy crystals which soon form are pulverized, dissolved in 
Zh water, and. decomposed with a corresponding quantity of sulphuric 
acid, ae ae ei atss é ; Tide BPs 
M4. A ready Method of preparing Hypochlorous Acid ; by M. Wit- 
Mamson, (Journ. de Chem. Med., March, 1846.)—Saturate a neutral 
Solution of sulphate of soda, at the ordinary temperature, with chlorine... 
large amount of chlorine will be absorbed, and the liquid will con- 
‘ain bisulphate of soda, chloride of sodium, and hypochlorous acid. If 
the liquid be distilled, the hypochlorous: acid will come over with the 
_ MISt portions of water. ‘This acid will be found very useful in the lab- 
: : Oratory > as it possesses an oxydizing agency superior to nitric acid at 
oe the ordinary temperature. . fog sae J.-L. §, 
ws. Preparation of Chromic Acid; by M..Botty, (Annal. der Chem. 
» Ind Pharm., vol. Ivi, p. 113,)—This is @ modification of Pritzsche’s 
: “Method, and is based upon the fact that concentrated sulphuric acid 
‘Precipitates chromic acid from solution if a little water be present. 
Take a weighed ortion of bichromate of potash and make a boiling 
‘Saturated solution ; during ebullition, add sufficient concentrated sulphu- 
acid to form isulphate with the potash of the chromate. Decant the 
Stcoxp Sznizs, Vol. LI, No. 5.—Sept., 1846. 34 
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