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EC number: 934-716-8 | CAS number: -
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
According to REACH Annex XI Section 2, study is not relevant for a water based multi constituent substance containing inorganic dissociated and ionised compounds.
Key value for chemical safety assessment
Additional information
Table 1. Dissociation constants of constituents.
| Ion | pKa |
| CO32- | 10.33 |
| HCO3- | 6.35 |
| S2- | 11.96 |
| HS- | 7.04 |
Sodium hydroxide dissociates completely.
REFERENCES:
UNEP OECD (2002), SIDS Initial Assessment Report for SIAM 15: Sodium carbonate, available in: http://www.inchem.org/documents/sids/sids/Naco.pdf
UNEP OECD (2002), SIDS Initial Assessment Report for SIAM 14: Sodium hydroxide, available in: http://www.inchem.org/documents/sids/sids/NAHYDROX.pdf
WHO (1981) IPCS International Programme on Chemical Safety, Environmental Health Criteria 1:, Hydrogen sulfide, available in:
http://www.inchem.org/documents/ehc/ehc/ehc019.htm#SectionNumber:2.1
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