Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Handbook data

Data source

Referenceopen allclose all

Reference Type:
review article or handbook
Title:
Unnamed
Year:
1979
Reference Type:
review article or handbook
Title:
Unnamed
Year:
1985

Materials and methods

Principles of method if other than guideline:
no data
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
Methanethiol
EC Number:
200-822-1
EC Name:
Methanethiol
Cas Number:
74-93-1
Molecular formula:
CH4S
IUPAC Name:
methanethiol

Results and discussion

Dissociating properties:
yes
Dissociation constant
No.:
#1
pKa:
10.33
Temp.:
25 °C

Applicant's summary and conclusion

Conclusions:
The dissociation constant of methylmercaptan was measured to be 10.33 @ 25°C.