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EC number: 701-065-4 | CAS number: -
Dissociation constant
Administrative data
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Secondary literature
Data source
Referenceopen allclose all
- Reference Type:
- review article or handbook
- Title:
- Synthetic Amorphous Silica (CAS No. 7631-86-9)
- Author:
- ECETOC
- Year:
- 2 006
- Bibliographic source:
- JACC Report No. 51, European Centre for Ecotoxicology and Toxicology of Chemicals, Brussels, September 2006
- Reference Type:
- publication
- Title:
- The structure of the silica/electrolyte interface
- Author:
- Yates DE, Healy TW
- Year:
- 1 976
- Bibliographic source:
- J Coll Interf Sci 55, 9 - 19 (cited from ECETOC JACC No. 51, 2006)
- Reference Type:
- review article or handbook
- Title:
- Hydroxyl groups on silica surfaces
- Author:
- Burneau A, Gallas JP
- Year:
- 1 998
- Bibliographic source:
- In: The surface properties of silicas (Legrand AP, ed) , Chapter 3, J Wiley and Sons, Chichester, UK, pp 147-234 (cited from ECETOC JACC No. 51)
- Reference Type:
- review article or handbook
- Title:
- The Chemistry of Silica
- Author:
- Iler RK
- Year:
- 1 979
- Bibliographic source:
- John Wiley & Sons, N.Y. 1979 (from Löbbus et al. 1998)
Materials and methods
Test guideline
- Qualifier:
- no guideline available
- Principles of method if other than guideline:
- There was no guidelines followed.
- GLP compliance:
- no
Test material
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- Cas Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Constituent 1
- Specific details on test material used for the study:
- Synthetic amorphous silicas:
CAS-No. 112945-52-5, CAS-Name: Silica, amorphous, fumed, crystalline-free;
CAS-No. 112926-00-8, CAS-Name: Silica gel, precipitated, crystalline-free.
Results and discussion
- Dissociating properties:
- yes
Dissociation constantopen allclose all
- pKa:
- 9.8
- Remarks on result:
- other: monosilicic acid (orthosilicic acid)
- pKa:
- 7.1
- Remarks on result:
- other: surface silanol groups
Any other information on results incl. tables
The acidity increases with the degree of polymerisation.
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