Mk. Bkown on the Products of the Soda Manufacture. 275 



by chlorate of potash and muriatic acid, and the sulphuric acid thus 

 formed precipitated by chloride of barium. But as this method does not 

 yield very accurate results, the amount of bisulphuret of calcium given 

 below can only be considered as an approximation : — 



Waste. BaOS0 3 Sulphur. Sulphur p.c. CaS, p.c. 

 358 gave, 1145 1579 2205 3*583 



13. Hyposulphite of lime. 



About 100 grains of tho waste were digested for twenty-four hours 

 with a solution of oxalate of potash. A salt of the oxide of copper was 

 then added, by which all the sulphur was precipitated. The precipi- 

 tated sulphuret of copper was separated by filtration; and to the filtered 

 solution, sulphuric acid was added. At first, no precipitation took 

 place; but after standing for one or two hours the solution became 

 slightly turbid. The quantity of sulphur was, however, too small for 

 estimation. 



14. Water. 



Waste. Water p.c. 

 100 grains lost by drying at 212°, 2*10 



Soluble salts, 26264 



Insoluble salts, 73*736 



100000 



Sulphate of lime, 4-281 



Sulphur, 13-182 



Silica, 5-280 



Sand, 5-746 



Peroxide of iron, 5*716 



Lime, 44762 



Magnesia, 0*707 



Carbonic acid, 11*190 



Carbon, 12'079 



Carbonic acid in insoluble salts, ... 10*657 



Lime in insoluble salts, 30*448 



Bisulphuret of calcium, 3*583 



Hyposulphite of lime, trace. 



Water, 2-10 



Carbonic 

 Lima Sulphur. Acid. 



Carbonate of lime, 24*220 13*563 — 10*657 



3CaSCaO, 20*363 16*769 7*187 — 



Carbon, 12*709 — — — 



Silicate of magnesia, 5*987 — — — 



Sand, 5*746 — — — 



Peroxide of iron, 5*716 — — — 



