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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Work performed in manufacturer's laboratories using well established methods
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 112 (Dissociation Constants in Water)
GLP compliance:
no
Specific details on test material used for the study:
Batch number of test material: B-05-3234
Dissociating properties:
yes
No.:
#1
pKa:
ca. 0
Temp.:
20 °C
No.:
#2
pKa:
ca. 0
Temp.:
20 °C
Conclusions:
The substance will dissociate readily at low pH and is itself strongly acidic. However, full assessment was not possible in view of precipitation at higher pH.

The studies is perhaps not useful in the context of risk assessment, but a valid attempt was made to make an assessment.

Description of key information

Note that the material is highly acidic

Attempts to raise the pH to over 2.3 resulted in solid precipitation (hydroxides)

Key value for chemical safety assessment

pKa at 20°C:
0

Additional information