Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 202-461-5 | CAS number: 95-87-4
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
pKa: 10.41 at 25°C
Key value for chemical safety assessment
Additional information
A literature review was conducted. In a weight of evidence approach the literature values were evaluated. Kortum (1961) reports the dissociation constant to be pKa = 10.41 at 25 °C. The REAXYS database reports two independent literature values (Tomas et al. 1987 and Riccardi et al. 1957). In both publications the dissociation constant was reported to be 10.43 at 25 °C and 10.46 at 20 °C. In addition the Lange's Handbook of Chemistry (15th Edition) reports the dissociation constant to be 10.22 without information about the temperature. All values are in the same range. The dissociation constant of 10.41 represents the median of all values and therefore was chosen as key value.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
