22 Mr. J. Brown on the Products of the Soda Manufacture. 



4. Soda. — The total quantity of available soda, that is, soda 

 existing as carbonate, sulphuret and hydrate, was determined in 

 the following manner : — A portion of the soda ball was thrown 

 on a filler and washed with warm water until all the soluble mat- 

 ter was taken up ; the filtered solution was then exactly neu- 

 tralized by dilute sulphuric acid, which was afterwards preci- 

 pitated by chloride of barium. From the quantity of sulphate 

 of barytes thus obtained, the amount formerly got from the 

 sulphate of soda was deducted, and from the remainder the 

 per-centage of alkali was calculated. 



Soda ball. BaO, SO3. BaO, SO3. BaO, SO3 p. c. Soda p. c. 



44-60 gave 40-60 91-031 — l-872 = 89-159 24*593 



100 ... 88-96 88-960— 1-872 = 87-088 24-024 



48-50 ... 42-76 88-164 — 1-872 = 86-292 23-800 



Average 24-138 



5. Sulphur. — The amount of sulphur was determined in two 

 different ways:--lst. The soda ball, after being very carefully 

 pulverized, was intimately mixed with about four times its 

 weight of nitrate of potash and heated in a covered platinum 

 crucible. The nitrate of potash was thus decomposed, and 

 the sulphur converted into sulphuric acid by the oxygen of 

 the nitric acid. 



KO,N02 03+S=S03 + KO + N02. 



The fused mass was dissolved by muriatic acid, and after fil- 

 tering the solution, the sulphuric acid was precipitated by 

 chloride of barium. 2. The soda ball, moistened with a small 

 quantity of water, was intimately mixed with a quantity of 

 finely pulverized chlorate of potash, and to this muriatic acid 

 was added, drop by drop, until upon a fresh addition of acid 

 no more gas was evolved. The flask containing the substance 

 was then gently heated by means of a water-bath, care being 

 taken to keep the temperature below 180° F., as chlorous acid 

 explodes with great violence at about 200° F. When all action 

 had ceased, the solution was filtered, and the sulphuric acid 

 precipitated by chloride of barium. From the weight of the 

 sulphate of barytes thus obtained, the former quantity, 1-872, 

 was deducted, and from the number thus found the amount 

 of sulphur was calculated. 



Soda ball. BaO, SO3. BaO, SO3 per cent. Sulphur per cent. 



By 1st / 19-34 gave 17-90 92-554- 1-872=90-628 12-507 



method. I 19-53 ... 18-20 93-189— 1-872=:91-3] 7 12-595 



By2nd?28-90 ... 27-00 93-425-1 •872=91-553 12-627 



method. 129-60 ... 2720 91-891-1-872=90019 12-416 



Average 12536 



