Potassium Carbonate
K2CO3 (anhydrous)
138.21
Carbonic acid, dipotassium salt. Dipotassium carbonate [584-08-7]. Sesquihydrate 165.23 » Potassium Carbonate contains not less than 99.5 percent and not more than 100.5 percent of K2CO3, calculated on the dried basis.
Packaging and storage
Preserve in well-closed containers.
Loss on drying 731
Dry it at 180 for 4 hours: it loses not more than 0.5% of its weight.
Insoluble substances
Dissolve 1 g in 20 mL of water: the solution is complete, clear, and colorless.
Heavy metals 231
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: the limit is 0.0005%.
Assay
Transfer the dried potassium carbonate obtained in the test for Loss on drying to a flask with the aid of 150 mL of water, add 4 drops of methyl orange TS, and titrate with 1 N hydrochloric acid VS. Each mL of 1 N hydrochloric acid is equivalent to 69.11 mg of K2CO3.
Auxiliary Information
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Chromatographic Column
USP32NF27 Page 3336
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.
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