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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2020
Report date:
2020

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 112 (Dissociation Constants in Water)
Deviations:
no
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Pivalic acid
EC Number:
200-922-5
EC Name:
Pivalic acid
Cas Number:
75-98-9
Molecular formula:
C5H10O2
IUPAC Name:
2,2-dimethylpropanoic acid
Details on test material:
- Name of test material (as cited in study report): MRD-64-1
- Substance type: white crystalline powder
Specific details on test material used for the study:
Test item: Pivalic Acid.
Test item identity (including alternative names): 2, 2-dimethylpropanoic acid, VERSATIC™ Acid 5.
CAS number: 75-98-9
Intended use: Industrial Chemical, used in many chemical manufacturing processes.
Appearance: White crystalline solid at 20. .
Storage conditions: At ambient temperature (15 to 25C).
Supplier: Sponsor
Batch number: PV8A0174
Expiry date: Technical data sheet stated that the shelf life should be three years starting from the date of manufacture.
Physical state Solid at 20°C, liquid at 35°C.
Purity: 99.4%

Results and discussion

Dissociating properties:
yes
Dissociation constant
pKa:
4.85
Temp.:
20 °C

Applicant's summary and conclusion

Conclusions:
The dissociation constant in water of the test item at 20.0 ± 0.5 °C has been determined to be 4.85.
Executive summary:

The dissociation constant in water of Pivalic acid at 20.0 ± 0.5 °C has been determined to be 4.85, using a titration method designed to be compatible with Method 112 of the OECD Guidelines for Testing of Chemicals, 12 May 1981.