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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 947-756-6 | CAS number: -
Dissociation constant
Administrative data
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP-compliant, non-guideline study following sound scientific principles, available as a published, peer-reviewed journal article. Limitations in design and/or reporting but otherwise adequate for assessment.
Data source
Reference
- Reference Type:
- publication
- Title:
- Effect of degree, type and position of unsaturation on the pKa of long-chain fatty acids
- Author:
- Kanicky JR, Shah DO
- Year:
- 2 002
- Bibliographic source:
- Journal of colloid and interface science, vol. 256, pp. 201-207
Materials and methods
- Principles of method if other than guideline:
- Potassium stearate was titrated with 0.1 M hydrocloric acid at 20°C to determine the neutralisation endpoint. The dissociation constant was determined from the mean of five titrations of each solution. The pKa was calculated as the solution's pH at half the neutralisation volume.
- GLP compliance:
- no
Test material
- Reference substance name:
- Potassium stearate
- EC Number:
- 209-786-1
- EC Name:
- Potassium stearate
- Cas Number:
- 593-29-3
- Molecular formula:
- C18H36O2.K
- IUPAC Name:
- potassium stearate
- Test material form:
- not specified
- Details on test material:
- - Source: Fisher Scientific, Fair Lawn, NJ
- Purity: ≥97 %
Constituent 1
Results and discussion
- Dissociating properties:
- yes
Dissociation constant
- No.:
- #1
- pKa:
- 10.15
- Temp.:
- 20 °C
- Remarks on result:
- other: Mean of five replicates
Applicant's summary and conclusion
- Conclusions:
- The dissociation constant, pKa, of potassium stearate is 10.15 at 20°C.
- Executive summary:
Kanicky and Shah (2002) titrated potassium stearate with hydrochloric acid and calculated the mean pKa from the pH at half the neutralisation volume for each of the five replicates. The study is a non-GLP, non-guideline experiment, available in a peer-reviewed published journal article. The experiment follows sound scientific principles, with limitations in design and/or reporting, and is considered adequate for assessment.
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.
