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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 244-742-5 | CAS number: 22036-77-7
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
Dissociation constant (EDTMP-xNa): EDTMP acid has eight ionisable phosphonate groups.
Key value for chemical safety assessment
Additional information
The dissociation constant of EDTMP-xNa is read across from its parent acid. Eight dissociation constants as listed below were obtained for the acid using an appropriate estimation method. The result is considered reliable and selected as key study. pKa1 = 1.3 pKa7 = 8.8 pKa8 = >10 Also, in a secondary source to which no reliability could be assigned, EDTMP-H has eight dissociation constants as listed below: 1.46 7.43 10.60
An approximate experimental determination, using stocichiometric titration and pH determination of aqueous solutions, has been conducted. This is considered to provide suitable and practical information, which is fit for purpose in the context of REACH chemical safety assessment. This data is reported in section 4.20. |
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.
