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Physical & Chemical properties

Dissociation constant

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Administrative data

Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
Study period:
no data
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study without detailed documentation, Read across to maleic anhydride

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2002

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: OECD105
Deviations:
yes
Remarks:
see below (details on methods)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
gas under pressure: refrigerated liquefied gas
Details on test material:
Hydrolysis to maleic acid occurs in aqueous conditions, so test substance was likely a mixture of maleic anhydride, maleic acid and its salts. Maleic acid was the analyte measured.

Results and discussion

Dissociating properties:
yes
Dissosciation constantopen allclose all
No.:
#1
Temp.:
25 °C
Remarks on result:
other: K=1.14 x 10^-2 (pH = 1.94)
No.:
#2
Temp.:
25 °C
Remarks on result:
other: 5.95 x 10^-7 (pH = 6.22)

Any other information on results incl. tables

K =  1.14 x 10-2(pH = 1.94) and 5.95 x 10-7(pH = 6.22) at 25 ºC

Applicant's summary and conclusion

Conclusions:
K =  1.14 x 10-2(pH = 1.94)
K = 5.95 x 10-7(pH = 6.22) at 25 ºC