Registration Dossier

Administrative data

Endpoint:
pH
Type of information:
other: company data
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Information contained in a compilation of physico-chemical characteristics of terephthalic and isophthalic acids, drawn from company data/information relevant to the commercial production of TPA and IPA at the Amoco Chemical Company and from other sources.
Cross-reference
Reason / purpose:
reference to same study

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
1986
Report Date:
1986

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Procedure not stated
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
No details provided, assumed to be representative of commercial production

Results and discussion

pH valueopen allclose all
pH value:
3.88
Temp.:
25 °C
Concentration:
other: saturated aqueous solution
Remarks on result:
other: pH measured
pH value:
3.85
Temp.:
40 °C
Concentration:
other: saturated aqueous solution
Remarks on result:
other: pH measured
pH value:
3.81
Temp.:
50 °C
Concentration:
other: saturated aqueous solution
Remarks on result:
other: pH measured
pH value:
3.69
Temp.:
70 °C
Concentration:
other: saturated aqueous solution
Remarks on result:
other: pH measured
pH value:
3.57
Temp.:
90 °C
Concentration:
other: saturated aqueous solution
Remarks on result:
other: pH measured
pH value:
3.3
Temp.:
100 °C
Concentration:
other: saturated aqueous solution
Remarks on result:
other: pH predicted from estimated pK

Any other information on results incl. tables

Measured pH data were in good agreement with predicted Ka values.

Applicant's summary and conclusion

Conclusions:
The pH of a saturated aqueous solution of terephthalic acid at 25 degrees C is 3.88.