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Physical & Chemical properties

Dissociation constant

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Reference
Endpoint:
dissociation constant
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
no guideline followed
Principles of method if other than guideline:
Assessment based on the properties of the substance and its chemical structure.
GLP compliance:
no
Dissociating properties:
no
Conclusions:
The substance is not expected to dissociate under normal conditions.
Executive summary:

The dissociation constant of the substance was determined based on an assessment of the properties and chemical structure of the substance. The structural assessment suggests that there will be no dissociation under normal environmental or biological conditions. Under extreme acid or basic conditions, the OH group at the end of each ethylene oxide group could in theory dissociate, but the conditions would need to be more extreme than found under normal biological conditions, therefore the substance is not expected to dissociate under normal conditions.

Description of key information

This test does not need to be conducted as it is considered not possible to test the substance accurately based on the properties of the substance and in accordance with column 2 of REACH Annex IX. The substance is surface active, multi-constituent and poorly water soluble, making testing of the substance difficult. Based on its structure, the substance is not expected to dissociate under normal environmental or biological conditions. 

Key value for chemical safety assessment

Additional information

A structural assessment of the substance suggests that there will be no dissociation under normal environmental or biological conditions. Under extreme acid or basic conditions, the OH group at the end of each ethylene oxide group could in theory dissociate, but the conditions would need to be more extreme than found under normal biological conditions, therefore the substance is not expected to dissociate under normal conditions.