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



Average 5*716 



5. Lime. — After the iron had been precipitated by am- 

 monia, the lime was thrown down by oxalic acid. 



Waste. CaO, CO2. CaO. CaO per cent. 



21-40 gave 17-10 9-576 44-747 



48-90 ... 39-10 21-896 44-777 



Average 44-762 



6. Magnesia. — After separating the lime the magnesia was 

 precipitated by phosphate of soda and ammonia. 



Waste. 2MgO, P^ O5. MgO. MgO per cent. 



48-90 gave 970 0*346 0707 



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 ba- 

 rytes, and from the quantity of carbonate of barytes thus pre- 

 cipitated the amount of carbonic acid was calculated. 



Waste. BaO,C02. CO2. CO2 per cent. 



30-80 gave 15*65 3*513 11*406 



27*20 ... 13*30 2*985 10*974 



Average 11*190 



8. Soluble and insoluble salts. — The whole of the soluble 

 matter was extracted by water, and the residue dried at 212° 

 and weighed. 



Waste. Insol. matter. Insol. matter p. c. Sol. matter 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. SiO sand and carbon. Carbon. Carbon per cent 



50 gave . 11*552, lost on ignition 6*039 12*078 

 Insoluble salts per cent. 61-658 



10. Carbonic acid in insoluble salts. 



Waste. BaO.COa. 



20-30 gave 15-70 



11. Lime in insoluble salts. 



Waste. CaOjCOj. 



23-80 gave 20-90 



