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Dissociation constant

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Reference
Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
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:
not specified
GLP compliance:
not specified
Specific details on test material used for the study:
Name: SYLOSIV A4
Batch no.: 1000361205
CAS no.: 1318-02-1
Composition: Zeolite (crystalline Aluminium silicate) 95-100 %
Storage: room temperature (20 ± 5 °C)
Expiry date: 31. Jan. 2022
Stability: stable under storage conditions
Appearance: off-white powder
Purity: not applicable, UVCB
Homogeneity: homogeneous
Production date: 01. Dec. 2020
EC no.: 215-283-8 (930-915-9)
Molecular formula: not stated
Molecular weight: not stated
Vapour pressure: 0 hPa
Solubility in solvents: H2O: 0.1 - 1 g/L; EtOH: not stated; acetone: not
stated; CH3CN: not stated; DMSO: not stated
Stability in solvents: H2O: not stated; EtOH: not stated; acetone: not stated; CH3CN: not stated; DMSO: not stated
Dissociating properties:
yes
No.:
#4
pKa:
ca. 10.34
Temp.:
20.2 °C
No.:
#3
pKa:
ca. 10.362
Temp.:
20.4 °C
No.:
#2
pKa:
ca. 10.344
Temp.:
20.2 °C

At the three main determinations the pKa1 showed a standard deviation below 0.1. Therefore, the study can be considered as valid.


Results of this study are stated as follow:
The pKa was calculated as 10.348 ± 0.012
and
The pKb was calculated as 3.652 ± 0.012


These values are the means of three independent determinations ± their standard deviations.


Also, very slightly EQP’s were visible in the pH-range of 9.1 – 6.0. But due to the low solubility of the test substance these EQP’s cannot be evaluated.


No observations were made which might cause doubts concerning the validity of the study outcome.

Conclusions:
The pKa was calculated as 10.348 ± 0.012 and the pKb as 3.652 ± 0.012.

These values are the means of three independent determinations ± their standard deviations.
Executive summary:

The dissociation constant of Sylosiv A4 was assessed according to OECD guideline 112. The substance had dissociating properties, its pKa was calculated as 10.348 ± 0.012.

Description of key information

The substance had dissociating properties, its pKa was calculated as 10.348 ± 0.012.

Key value for chemical safety assessment

pKa at 20°C:
10.348

Additional information

The pKa was calculated as 10.348 ± 0.012 and the pKb as 3.652 ± 0.012.


These values are the means of three independent determinations ± their standard deviations.