(poe tas' ee um kar' bo nate).
K2CO3 (anhydrous) 138.21
Carbonic acid, dipotassium salt;
Dipotassium carbonate [584-08-7].
Potassium Carbonate contains NLT 99.5% and NMT 100.5% of K2CO3, calculated on the dried basis.
• A. Identification TestsGeneral, Potassium 191: Meets the requirements
• B. Identification TestsGeneral, Carbonate 191: Meets the requirements
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
• 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
• 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.
• Packaging and Storage: Preserve in well-closed containers.