200 PREPARATION OF CHLORATE OF SODA AND BARYTES. 
ART. LVIL— ON A NEW METHOD OF PREPARING CHLORATE 
OF SODA AND CHLORATE OF BARYTES. 
By Dr. C. G. Wittstein. 
When carbonate of soda is treated with chlorine, the 
chlorate of soda formed cannot be separated by crystalliza- 
tion from the chloride of sodium in the same manner as 
with the corresponding potash compound, both salts being 
soluble in nearly equal proportion in water. Nor can their 
separation be well effected by spirit, since 1 part of the 
chlorate of soda requires for solution 34 of alcohol, while 1 
part chloride of sodium requires 260. When 1 equiv. chlo- 
ride of sodium is mixed with 6 equiv. lime, and chlorine 
passed through, not a trace of chlorate of soda is obtained, 
but the chloric acid generated remains in combination with 
the lime. The usual method of preparing the chlorate of 
soda is to mix chlorate of potash with bitartrate of soda, 
separating the bitartrate of potash by filtration and crystal- 
lizing the solution. The chlorate of soda, however, so ob- 
tained contains tartrates, as may be seen by its becoming 
black when heated. As these methods of preparation are 
by no means advantageous, the author advises the follow- 
ing plan: — 3 parts of crystallized sulphate of ammonia and 
3 parts of chlorate of potash are dissolved in a porcelain 
dish in 15 parts hot water, and evaporated over the water- 
bath to the consistence of a thin paste, being constantly 
agitated. This paste is then conveyed into a glass flask, 4 
times its weight of alcohol of O.S33 spec. grav. poured over 
it, digested for a day at a gentle heat, filtered, and the re- 
siduous saline mass washed with spirit. A fourth part by 
weight in water is now added to the mixed fluids, the 
spirit distilled off, the residue diluted with an equal weight 
of water, 5 parts pulverized, crystallized carbonate of soda 
added, and when no more ammonia is disengaged, evapo- 
