Registration Dossier
Registration Dossier
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EC number: 215-662-8 | CAS number: 1338-24-5
Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Principles of method if other than guideline:
- Data was taken from a peer-reviewed article or handbook
- Dissociating properties:
- yes
- No.:
- #1
- pKa:
- >= 5 - <= 6
- Temp.:
- 25 °C
- Conclusions:
- Dissociation constants of naphthenic acids are in the order of 10^(-5) to 10^(-6).
Reference
Chemically, naphthenic acids behave like typical carboxylic acids with similar acid strengths as the higher fatty acids. Dissociation constants are in the order of 10-5 to 10-6. They are slightly weaker acids than low molecular weight carboxylic acids such as acetic acid, but are stronger acids than phenol and cresylic acid.
Description of key information
Dissociation constants are in the order of 10-5 to 10-6 based on literature data considered reliable with restrictions (K2) and assigned as key study.
Key value for chemical safety assessment
- pKa at 20°C:
- 5
Additional information
Chemically, naphthenic acids behave like typical carboxylic acids with similar acid strengths as the higher fatty acids. Dissociation constants are in the order of 10-5to 10-6. They are slightly weaker acids than low molecular weight carboxylic acids such as acetic acid, but are stronger acids than phenol and cresylic acid.
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