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Dissociation constant

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dissociation constant
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is hydrolytically unstable (half-life less than 12 hours)

Description of key information

Data Waived

Key value for chemical safety assessment

Additional information

Value used for CSA: TPA: pKa1 = 3.5; pKa2 = 4.34 at 20°C

Due to the rapid hydrolysis of the test substance, data for the primary degradation product, terephthalic acid, is provided. Since the degradation product has 2 pKa values it will exist as the anionic species in the environment.