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EC number: 931-558-1 | CAS number: 90583-11-2
Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2010-06-11 to 2010-06-15
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 112 (Dissociation Constants in Water)
- Deviations:
- no
- Principles of method if other than guideline:
- not reported
- GLP compliance:
- no
- Dissociating properties:
- yes
- pKa:
- 1.89
- Temp.:
- 20 °C
Reference
The system was checked at 20 °C by using a KCl solution 0.01 mol/L.
The sample was measured with seven concentrations.
Concentration |
Specific conductivity |
Equivalent conductivity |
Reciprocal equivalent conductivity |
c |
κ |
Λ |
1 / Λ |
Mol/L |
mS/cm |
S cm2/ mol |
Mol/S cm2 |
0.00344 |
0.302 |
87.7907 |
0.01139 |
0.00172 |
0.1584 |
92.0930 |
0.01086 |
0.00086 |
0.0829 |
96.3953 |
0.01037 |
0.00043 |
0.04335 |
100.8140 |
0.00992 |
0.000215 |
0.02185 |
101.6279 |
0.00984 |
0.0001075 |
0.0115 |
106.7967 |
0.00935 |
0.00005375 |
0.00585 |
108.8372 |
0.00919 |
For further calculation Ostwald dilution law was used:
Result: Ka = 1.30 * 10 -2 mol/L
pKa = 1.89
Description of key information
The dissociation constant is pKa = 1.89 at 20 °C (OECD 112).
Key value for chemical safety assessment
Additional information
The dissociation constant of the substance was determined using conductometric method, in accordance with OECD Guideline 112.
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