604 FOODS AND FOOD ADULTERANTS. 



PROBABLE PERCENTAGE COMBINATION. 



Sodium bicarbonate, NaHCO 3 9.01 



(Residual sodium oxide, Na 3 O) 10. '32 



Ammonium bicarbonate, NsHnCaOe .74 



Free tartaric acid, H 2 C 4 H 4 06 21.00 



(Sulphuric acid, S0 3 ) .61 



Starch 45.63 



Water... 12.69 



100. 00 



The sulphuric acid in this sample probably is present as sodium sul- 

 phate, which may be simply an impurity in some of the salts. 



PHOSPHATE POWDERS. 



5506. Wheat Baking-Powder. 



[Made by Martin Kalbfleisch's Sons, New York.] 



Available carbonic acid per cent.. 3.79 



Cubic inches per ounce of powder at 212 F 45. 5 



PERCENTAGE COMPOSITION. 



Total carbonic acid, CO 3 5. 57 



Sodium oxide, Na^O .' 14. 10 



Potassium oxide, K 2 O 7.49 



Calcium oxide, CaO 11.06 



Phosphoric acid, P. 2 O 5 36.69 



Sulphuric acid, SOj .16 



Ammonia, NH 3 .16 



Water of combination and association by difference 2:>. -'? 



100. 00 



This powder is quite peculiar in its make-up. It contains no starch 

 or filling and has a very low per cent, of available gas. It contains a 

 small quantity of ammonia bicarbonate. It contains a considerable 

 amount of potassium oxide, which would indicate the presence of an 

 acid phosphate of potash, as there is no other possible combination for 

 this base, and the per cent, of lime is hardly sufficient to answer for all 

 the phosphoric acid present. 



5508. Rumford Yeast Powder. 

 [Made by Rumford Chemical Works, Providence, R.T.] 



Available carbonic acid per cent.. 12.96 



Cubic inches per ounce of powder at 212 F 151. f> 



PERCENTAGE COMPOSITION. 



Total carbonic acid, CO 2 i:>. 17 



Sodium oxide, Na 2 O I 1 ,'. ('>(' 



Potassium oxide, K 2 - : ''l 



Calcium oxide, CaO 1". -'7 



Phosphoric acid, P 2 O 5 



Starch 26.41 



Water of combination and association by difference 15. i (5 



100. 00 



