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EC number: 215-199-1 | CAS number: 1312-76-1
Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- other: handbook data
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Adopted according to OECD SIDS or other official EU regulatory procedures (public available peer-reviewed source)
- Principles of method if other than guideline:
- Handbook data, no further details
- GLP compliance:
- no
- Dissociating properties:
- yes
- No.:
- #1
- pKa:
- >= 9.9 - <= 12
- Temp.:
- 30 °C
Reference
Consideration of the high dissociation constants of silicic acid (pKa 9.9, 11.8, 12 & 12 at 30 °C) leads to the conclusion that at environmental pH values of 6.5 – 8.5 only a small proportion of silicate ions will be in solution.
Description of key information
pKa 9.9, 11.8, 12 at 30 °C
Key value for chemical safety assessment
Additional information
Consideration of the high dissociation constants of silicic acid leads to the conclusion that at environmental pH values of 6.5 ¿ 8.5 only a small proportion of silicate ions will be in solution (Lide & Frederikse 1995).
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