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EC number: 231-887-4 | CAS number: 7775-09-9
Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- other:
- Justification for type of information:
- JUSTIFICATION FOR DATA WAIVING
Chloric acid belongs to the common strong acids with a pKa < 0. Reported pKa values for chloric acid are in the range from pKa = -1 to approx. pKa = -3. This means that the pH of an aqueous solution for a pKa determination should be brought into the range of pH < 0 with a very strong acid which is impossible. Acidity constants or dissociation constants, respectively, of such strong acids are normally obtained by thermodynamic and quantum chemical calculations. Furthermore, sodium chlorate is incompatible with strong acids, decomposes and produces toxic chlorine and chlorine dioxide gas. An experimental determination of the dissociation constant of sodium chlorate is not possible due to its strong acidity and because the sodium chlorate decomposes on acidification. Based on the available information, the pKa of sodium chlorate is in the range from pKa = -1 to pKa = approx. -3.
Reference
Description of key information
Data waiving (study technically not feasible): An experimental determination of the dissociation constant of sodium chlorate is not possible due to its strong acidity and because the sodium chlorate decomposes on acidification. Based on the available information, the pKa of sodium chlorate is in the range from pKa = -1 to pKa = approx. -3.
Key value for chemical safety assessment
Additional information
Data waiving (study technically not feasible): Chloric acid belongs to the common strong acids with a pKa < 0. Reported pKa values for chloric acid are in the range from pKa = -1 to approx. pKa = -3. This means that the pH of an aqueous solution for a pKa determination should be brought into the range of pH < 0 with a very strong acid which is impossible. Acidity constants or dissociation constants, respectively, of such strong acids are normally obtained by thermodynamic and quantum chemical calculations. Furthermore, sodium chlorate is incompatible with strong acids, decomposes and produces toxic chlorine and chlorine dioxide gas. As a conclusion, an experimental determination of the dissociation constant of sodium chlorate is not possible due to its strong acidity and because the sodium chlorate decomposes on acidification. Based on the available information, the pKa of sodium chlorate is in the range from pKa = -1 to pKa = approx. -3.
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