Registration Dossier
Registration Dossier
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EC number: 231-634-8 | CAS number: 7664-39-3
Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 112 (Dissociation Constants in Water)
- GLP compliance:
- no
- Dissociating properties:
- yes
- pKa:
- 3.19
- Remarks on result:
- not measured/tested
- Remarks:
- Temperature not known
- Conclusions:
- The pKa of the test substance is 3.19
- Executive summary:
The pKa of the test substance is 3.19
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- No details reported
- GLP compliance:
- no
- Remarks:
- published handbook
- Dissociating properties:
- yes
- pKa:
- 3.17
- Temp.:
- 25 °C
- Conclusions:
- The pKa of hydrofluoric acid (aqueous ) is reported to be 3.17
- Executive summary:
The pKa of hydrofluoric acid (aqueous ) is reported to be 3.17
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Measurement of dissocitation constant using the indicator technique
- GLP compliance:
- no
- Remarks:
- published literature study
- Dissociating properties:
- yes
- pKa:
- 3.14
- Temp.:
- 25 °C
- Remarks on result:
- other: Atmospheric pressure
- Conclusions:
- The pKa for hydrofluoric acid at atmospheric pressure was reported to be 3.14
- Executive summary:
The effect of pressure on the dissociation constant of hydrofluoric acid was determined using the indicator technique, at 25°C at an ionic strength of 0.1 M over a pressure range of 1 to 2000 atm. A value of 3.14 for pka at I =0 was obtained by extrapolation to zero ionic strength at 1 atm.
Referenceopen allclose all
No additional results
A pKa of 3.14 was obtained by extrapolation to zero ionic strength at 1 atm
Description of key information
The pKa of the substance is reported to be 3.19 (Merck Index), 3.14 (Usha & Atkinson, 1992) and 3.17 (Speight, 2005)
Key value for chemical safety assessment
- pKa at 20°C:
- 3.19
Additional information
The pKa of the substance is reported to be 3.19 (Merck Index), 3.14 (Usha & Atkinson, 1992) and 3.17 (Speight, 2005)
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