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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Endpoint:
dissociation constant
Type of information:
other: handbook
Adequacy of study:
supporting study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Handbook data are considered from a trusted source. The reference was peer-reviewed. In addition, the reference sources are indicated although not leading to sufficient information on the material & method used. However, data have not been taken from more sources and therefore these are not assignable.

Data source

Reference
Reference Type:
review article or handbook
Title:
DIssociation constants of inorganic acids and bases
Author:
Lide, D.R.
Year:
2000
Bibliographic source:
Handbook of Chemistry and Physics, 80th ed

Materials and methods

GLP compliance:
no

Test material

Constituent 1
Reference substance name:
Hydrocyanic acid (HCN)
IUPAC Name:
Hydrocyanic acid (HCN)
Constituent 2
Reference substance name:
Sodium ion (Na+)
IUPAC Name:
Sodium ion (Na+)

Results and discussion

Dissociating properties:
no
Dissociation constantopen allclose all
pKa:
9.21
Temp.:
25 °C
Remarks on result:
other: This value refers to the pKa of hydrocyanic acid
pKa:
14.8
Temp.:
25 °C
Remarks on result:
other: This value refers to the pKa of the sodium ion

Applicant's summary and conclusion