BAKING POWDERS. 613 



PROBABLE PERCENTAGE COMBINATION. 



Sodium bicarbonate, NaHCO 3 18.21 



(Residual sodium oxide, Na 2 O) - 1.60 



Ainmouia alum, auhydrous: 



Al a (SO 4 )s 15.78 



(NH 4 ) 2 SO 4 3.34 



19. 06 



Acid phosphate of lime, anhydrous: 



CaO 2.66 



P 2 8 1.78 



4.44 



Starch 1 43.92 



Water of association (phosphate) and crystallization (alum) 12.77 



100. 00 



5519. Silver Spoon Baking- Powder. 

 [Made by Smith, Hairway & Co., Baltimore, Md.] 



Available carbouic acid per cent.. 7. 33 



Cubic inches per ounce of powder at 212 F 88. 



PERCENTAGE COMPOSITION. 



Total carbonic acid, CO 2 8.26 



Sodium oxide, Na 2 O 7.26 



Potassium oxide, K 2 O .76 



Calcium oxide, CaO 2.29 



Aluminium oxide, Al 2 Os 3. 58 



Ammonia, NH 3 .91 



Phosphoric acid, P 2 O 5 3.61 



Sulphuric acid, SO 3 8.78 



Starch : 41.26 



Water of combination and association by difference 23.29 



100. 00 



PROBABLE PERCENTAGE COMBINATION. 



Sodium bicarbonate, NaHCO 3 16.13 



(Residual sodium oxide, Na 2 O) 1.44 



Ammonia alum, anhydrous: 



A1 3 (SO 4 ) 11.92 



(NH 4 ) 2 SO 4 72 



NH 3 78 



13. 42 



Acid phosphate of lime, anhydrous: 



Ca 3 (PO 4 ) 2 4.22 



H.,PO 4 - 2.32 



6.54 



Starch 41.26 



Water of association (phosphate) and crystallization (alum) 21.21 



100.00 



