Registration Dossier
Registration Dossier
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EC number: 209-529-3 | CAS number: 584-08-7
Endpoint summary
Administrative data
Description of key information
Additional information
Potassium carbonate is characterized as an inorganic odourless substance which appears as a colourless, hygroscopic white powder or as hygroscopic crystals. The melting point of potassium carbonate is 891°C. The boiling point of potassium carbonate can not be determined due to decomposition. The relative density of potassium carbonate is 2.43 at 19°C. For potassium carbonate powder (for one sample) the mean particle sizes were determined to be D10: 3.5μm D50: 16.6μm D90: 58.6μm and particles with diameter r < 2μm are 11.4 % and r > 200μm make 0% according to laser diffraction method with dry dispersion (ISO 13321).
Based on the very high melting point (891°C), the vapour pressure of potassium carbonate is negligible at environmental conditions. The water solubility of potassium carbonate is in the range between 900 and 1105 g/L at 20°C. According to the classification, potassium carbonate can be regarded as very soluble in water. Potassium carbonate is insoluble in ethanol. The solubilities of potassium carbonate in other organic solvents at ambient temperature are 7.5 g/L in DMF, 47 g/L in DMSO, 4.6 g/L in N, N-dimethylacetamide, 16 g/L in sulfolane, and 23.7 g/L in N-methyl-2 –pyrrolidone. Potassium carbonate dissociates in water completely to K+ and inorganic carbon (CO32-ions in equilibrium withHCO3-and CO2). The dissociation constants of CO2 in water systems are 6.35 (pK1) and 10.33 (pK2) at 25°C in fresh water and 5.86 (pK1) and 8.95 (pK2) at 25°C in seawater (CO2 (solv) + H2O <=> H2CO3 => HCO3- => CO32 -). The pH of an aqueous solution of potassium carbonate is reported to be 11.6.
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