K2CO3 (anhydrous) 138.21
Carbonic acid, dipotassium salt.
Dipotassium carbonate [584-08-7].
» 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%.
Auxiliary Information Please check for your question in the FAQs before contacting USP.Chromatographic Column
USP32NF27 Page 3336
Chromatographic columns text is not derived from, and not part of, USP 32 or NF 27.