274 Mr. Brown on the Products of the Soda Manufacture. 



5. Lime. 



After the iron had been precipitated by ammonia, the lime was thrown 

 down by oxalic acid : — 



Waste. CaOC0 2 Ca O CaOp.c. 



21-40 gave, 17*10 9*576 44747 



48-90 — 3910 21-896 44777 



Average, 44762 



6. Magnesia. 



After separating the lime, the magnesia was precipitated by phosphate 

 of soda and ammonia : — 



Waste. 2MgOP0 5 Mg O MgOp.c. 



48-90 gave, 0-970 0-346 0-707 



7. Carbonic acid. 



A quantity of the waste was put into a flask, and dilute acid slowly 



added to it. The carbonic acid thus disengaged was passed through a 



solution of caustic barytes; and from the quantity of carbonate of 



barytes thus precipitated, the amount of carbonic acid was calculated : — 



Waste. BaOC0 2 C0 2 C0 2 p.c. 



30-80 gave, 1565 3-513 11-406 



27-20 — 13-30 2-985 10974 



Average, 11-190 



8. Soluble and insoluble salts. 



The whole of the soluble matter was extracted by water, and the resi- 

 due dried at 212°, and weighed : — 



Waste. Insol. Mat. Insol. Mat.p.c. Sol.Mat.p.c. 

 71-2 gave, -52-50 73-736 26-264 



9. Carbon. 



The amount of carbon was determined in the same way as in the ball 

 soda : — 



Waste. Si O Sand & C. Carbon. Carbon p.c. Insol. Salts p.c. 

 50 gave, 11-552, lost on ignition 6039 12-078 61-658 



10. Carbonic acid in insoluble salts. 



Waste. BaOC0 2 C0 2 CO 2 in Insol Salts. 

 20-30 gave, 1570 3-525 ... 10-657 



11. Lime in insoluble salts. 



Waste. CaOC0 2 CaO CaO in Insol. Salts. 

 23-80 gave, 20-90 11-704 30*448 



12. Bisulphuret of calcium. 



A portion of the waste was digested with muriatic acid and a large 

 quantity of water, and heated till the whole of the sulphuretted 

 hydrogen was dissipated. The sulphur which remained was then oxydized 



