Report of the Committee on Editing Tentative and Offical Methods of Analysis, the Association of Official Agricultural Chemists . em. Bull. 105, p. 48.» Ibid., 13 (VII), p. 890. ? U. S. Treas. Dept., T. D. 35244, March 23, Ibid.; Proc. Eighth Intern. Cong. Appl. Chem., 1912, 18: 301. XXVIII. BAKING POWDERS AND THEIR INGREDIENTS. 1 PREPARATION OF SAMPLE.—TENTATIVE. Remove the entire sample from the package, mix carefully and pass through a20-40 mesh sieve. TOTAL CARBON DIOXID. 2 General Method.—Tentative. Make the determination by the absorption method, employing any apparatuswhich gives
Report of the Committee on Editing Tentative and Offical Methods of Analysis, the Association of Official Agricultural Chemists . em. Bull. 105, p. 48.» Ibid., 13 (VII), p. 890. ? U. S. Treas. Dept., T. D. 35244, March 23, Ibid.; Proc. Eighth Intern. Cong. Appl. Chem., 1912, 18: 301. XXVIII. BAKING POWDERS AND THEIR INGREDIENTS. 1 PREPARATION OF SAMPLE.—TENTATIVE. Remove the entire sample from the package, mix carefully and pass through a20-40 mesh sieve. TOTAL CARBON DIOXID. 2 General Method.—Tentative. Make the determination by the absorption method, employing any apparatuswhich gives accurate results when checked with pure calcite. Whatever appara-tus is chosen, the tubes and materials used for absorbing and drying the carbondioxid may be varied according to the preference of the analyst. Use gramof sodium or calcium carbonate, according to the amount of absorbent employed,and in the case of baking powder grams. Method Using Knorrs Apparatus.—Tentative. 3 REAGENTS. (a) 50% potassium hydroxid solution. (b) Soda lime.—Finely granulated and freed from dust by sifting. 4 FIG. 14 KNORRS APPARATUS FOR THE DETERMINATION OF CARBON DIOXID. This consists of a flask (A), fitted by means of a ground-glass joint with a glassconnection through the upper part of which passes a dropping funnel (-B), andjoined at the side with a Liebig condenser (D). The mouth of the dropping funnel 339 340 METHODS OF ANALYSIS [Chap. (B) is connected by means of a perforated stopper with a soda lime tube (C). Theupper end of the Liebig condenser is connected by a rubber joint with a Geisslerbulb (E), containing sulphuric acid for drying the gas passing into the next Geisslerbulb (F), connected with (E), and containing strong potassium hydroxid solution(1 to 2). The bulb (F) is connected with a third Geissler bulb (G), containing sul-phuric acid for the absorption of moisture escaping from F. A fourth Geisslerbulb (H) is attached to G as a precaution to pr
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