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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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:
data from handbook or collection of data
Remarks:
Information contained in an authoritative, standard reference work in industrial chemistry. The authors were employed at the Amoco Chemical Company, with direct access to company data/information relevant to the commercial production of terephthalic acid.
Reason / purpose for cross-reference:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
Procedure not stated.
GLP compliance:
not specified
Dissociating properties:
yes
No.:
#1
pKa:
3.54
Temp.:
25 °C
Remarks on result:
other: In aqueous solution
No.:
#2
pKa:
4.46
Temp.:
25 °C
Remarks on result:
other: In aqueous solution
Conclusions:
The pK1 and pK2 values for terephthalic acid in aqueous solution at 25 degrees C are 3.54 and 4.46, respectively.

Description of key information

The pK1 and pK2 values for terephthalic acid in aqueous solution at 25 degrees C are 3.54 and 4.46, respectively. 

Key value for chemical safety assessment

Additional information