BAKING POWDERS. 603 



PROBABLE PERCENTAGE COMBINATION. 



Sodium oicarbonate, NaHCOs 20. 12 



(Residual sodium oxide, Na. 2 ) 3. 22 



Potassium bitartrate, KHC 4 H 4 6 - 55. 19 



Calcium sulphate, CaSO 4 .12 



(Calcium oxide, CaO) .61 



Starch 13.41 



Water of association 7.33 



100. 00 

 5513. Sterling Baking-Powder. 



[Made by Sterling Manufacturing Company, Baltimore, Md.] 



Available carbonic acid per cent. . 9.53 



Cubic inches per ounce of powder at 212 F 114 



Leavening gas (available CO a + NHs) per cent . . 9. 90 



Cubic inches per ounce of powder at 212 F 123. 3 



PERCENTAGE COMPOSITION. 



Total carbonic acid, CO Z 10.66 



Sodium oxide, Na 2 O 10.38 



Potassium oxide, K 2 O .66 



Calcium oxide, CaO .15 



Ammonia, NH 3 .37 



Tartaric acid, C 4 H 4 O 5 v 21.94 



Starch 40.05 



Water of combination and association by d ifference 15. 79 



100. 00 



PROBABLE PERCENTAGE COMBINATION. 



Sodium bicarbonate, NaHCO 3 19. 13 



(Residual sodium oxide, Na 2 O) 3. 32 



Ammonium bicarbonate, N 3 HnC 2 O 6 1. 14 



Free tartaric acid, H 2 C 4 H 4 O 6 24.93 



Starch 40.05 



Water of association .. 11.43 



100. 00 



This and the following are the only samples examined which were 

 made up with/ree tartaric acid as the sole acid constituent. Both con- 

 tain small quantities of ammonium bicarbonate. The small quantities 

 of potassium and calcium oxide probably exist as tartrates. 



5535. Our Best Baking-Powder. 

 [Made by the Purity Chemical Works, Philadelphia, Pa.] 



Available carbonic acid per cent . . 4.98 



Cubic inches per ounce of powder at 212 F 9.8 



Leavening gas (available CO 2 + NH 3 ) per cent.. 5.22 



Cubic inches per ounce of powder at 212 F 65. 5 



PERCENTAGE COMPOSITION. 



Total carbonic acid, CO 2 5. 13 



Sodium oxide, Na-jO 13.65 



Calcium oxide, CaO .07 



Ammonia, NH 3 .24 



Tartaric acid, C 4 H 4 O 5 18.48 



Sulphuric acid, SO 3 . .61 



Starch 45.63 



Water of combination and association by difference 16. 19 



100. 00 

 5360 pt. 5 1 , 



