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
High water solubility and very low vapour pressure indicate that potassium carbonate will be found predominantly in the aquatic environment.
Potassium carbonate dissociates completely in water to K+and inorganic carbon species. Both potassium and inorganic carbon are ubiquitously present in the environment. The concentrations of CO2, HCO3-and CO32-in aquatic ecosystemsaccording to the following equations:
CO2 (solv) + H2O (<=> H2CO3 (solv)) <=> HCO3(-) + H(+) (pKa 1 = 6.35)
HCO3(-) <=> CO3(2 -) + H(+) (pKa 2 = 10.33).
CO2 is the predominant species at pH values below 6.35, while HCO3-is the predominant species at a pH in the range between 6.35 and 10.33 and CO32-is the predominant species at pH values above 10.33.
In the majority of the natural waters, pH levels are between 6 and 10. Thus HCO3-(pKa= 10.33) is the most important species for the buffer capacity. Atmospheric emissions as aerosols are rapidly neutralized by carbon dioxide as occurs with other bases and the salts will be washed out by rain.Biodegradation is not relevant because potassium carbonate is an inorganic substance.
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