Potassium Carbonate (poe tas' ee um kar' bo nate). K2CO3 (anhydrous)138.21 K2CO3·1½H2O165.23 Carbonic acid, dipotassium salt; Dipotassium carbonate [584-08-7]. DEFINITION Potassium Carbonate contains NLT 99.5% and NMT 100.5% of K2CO3, calculated on the dried basis. IDENTIFICATION • A. Identification TestsGeneral, Potassium 191: Meets the requirements • B. Identification TestsGeneral, Carbonate 191: Meets the requirements ASSAY • Procedure Sample: Dried potassium carbonate obtained in the test for Loss on Drying Analysis: Transfer the Sample to a flask with the aid of 150 mL of water, and add 4 drops of methyl orange TS. Titrate with 1 N hydrochloric acid VS. Each mL of 1 N hydrochloric acid is equivalent to 69.11 mg of K2CO3. Acceptance criteria: 99.5%100.5% on the dried basis IMPURITIES • Heavy Metals 231 Analysis: Dissolve 4.0 g in 10 mL of water. Add 15 mL of 3 N hydrochloric acid, and heat to boiling. Add 1 drop of phenolphthalein TS, and neutralize with 1 N sodium hydroxide until the solution is faintly pink in color. Cool, and dilute with water to 25 mL. Acceptance criteria: NMT 5 ppm SPECIFIC TESTS • Loss on Drying 731: Dry a sample at 180 for 4 h: it loses NMT 0.5% of its weight. • Insoluble Substances Sample solution: 1 g in 20 mL of water Acceptance criteria: The solution is complete, clear, and colorless. ADDITIONAL REQUIREMENTS • Packaging and Storage: Preserve in well-closed containers. Auxiliary Information Please check for your question in the FAQs before contacting USP.
USP35NF30 Page 4359 Chromatographic Column Chromatographic columns text is not derived from, and not part of, USP 35 or NF 30. |