Aromatic Ammonia Spirit
» Aromatic Ammonia Spirit is a hydroalcoholic solution that contains, in each 100 mL, not less than 1.7 g and not more than 2.1 g of total NH3, and Ammonium Carbonate corresponding to not less than 3.5 g and not more than 4.5 g of (NH4)2CO3.
Packaging and storage—
Preserve in tight, light-resistant containers, at a temperature not exceeding 30
.
.
Assay for total NH3—
Transfer 10.0 mL to a 250-mL conical flask containing about 50 mL of water. Add 30.0 mL of 0.5 N sulfuric acid VS, and boil until the solution becomes clear. Cool, add methyl red TS, and titrate the excess acid with 0.5 N sodium hydroxide VS. Perform a blank determination (see Residual Titrations under Titrimetry 
541
). Each mL of 0.5 N sulfuric acid is equivalent to 8.515 mg of NH3.
541). Each mL of 0.5 N sulfuric acid is equivalent to 8.515 mg of NH3.
Assay for ammonium carbonate—
Transfer 10.0 mL to a flask of about 300-mL capacity. Add 30 mL of 0.5 N sodium hydroxide, and boil the mixture, replacing the water lost by evaporation, until the vapors no longer turn moistened red litmus paper blue. Cool, dilute with 100 mL of cold, carbon dioxide-free water, add about 6 drops of phenolphthalein TS, then add just enough 0.5 N sulfuric acid VS to discharge the color of the phenolphthalein. Add methyl orange TS, and titrate with 0.5 N sulfuric acid VS. Perform a blank determination (see Residual Titrations under Titrimetry 541). Each mL of 0.5 N sulfuric acid consumed in the titration with methyl orange TS is equivalent to 48.04 mg of (NH4)2CO3.
541). Each mL of 0.5 N sulfuric acid consumed in the titration with methyl orange TS is equivalent to 48.04 mg of (NH4)2CO3.
Auxiliary Information—
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| Topic/Question | Contact | Expert Committee |
| Monograph | Daniel K. Bempong, Ph.D.
Senior Scientist 1-301-816-8143 |
(MDPS05) Monograph Development-Pulmonary and Steroids |
USP32–NF27 Page 1533