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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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
Study period:
17 May 2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to guideline
Guideline:
OECD Guideline 112 (Dissociation Constants in Water)
GLP compliance:
no
Dissociating properties:
yes
pKa:
<= 2
Temp.:
23 °C

The dissociation constant was estimated on the free non-neutralised sulfuric monoester. The degree of dissociation at relevant pH values (5 -9) is equal or larger than 99.9%.

Description of key information

The dissociation constant is ≤ 2.0 at 23 °C.

Key value for chemical safety assessment

pKa at 20°C:
2

Additional information

The value is taken from a study report.

The dissociation constant was estimated on the free non-neutralised sulfuric monoester. The degree of dissociation at relevant pH values (5 -9) is equal or larger than 99.9%.