Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
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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.
Applicant's summary and conclusion
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
