Registration Dossier
Registration Dossier
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EC number: 296-664-6 | CAS number: 92908-35-5
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
pKa= 12 at 25°C
(estimated)
Key value for chemical safety assessment
Additional information
Since the substance is an UVCB which mainly consists of two types of oligomers thus the macroscopic pKa values on the structural unit of
both oligomers below have been generated by calculation using recommended software program SPARC,v.4.6.pKa1= 12.3 at 25°C (of 4,5-Dihydroxy-1,3-bis(hydroxymethyl)imidazolidin-2-one)
pKa2= 12.5 at 25°C ( of 4,5-Dihydroxy-1-hydroxymethyl-imidazolidin-2-one)
It can be concluded that the dissociation constant of test substance was estimated to be pKa= 12 at 25°C.
This would be suggested that the pKa value of test item is outside the environmentally relevant pH range, and that they would therefore be undissociated under normal conditions.
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