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Physical & Chemical properties

Dissociation constant

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Description of key information

The behaviour of the test substance is aqueous solutions is dominated by the strongly acidic ArSO3H-groups. Therefore, the molecule is negatively charged and is present in anionic form over the whole environmentally relevant pH range.

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Additional information

The dissociation constant in water of the test substance was calculated using the Hammett and Taft Correlation methods, and obtained from the literature (RCC 2006). Three pKa's were determined of which the pKa from the strongly acidic ArSO3H- groups is the most important one. The test substance has dissociating properties because the molecule will be negatively charged over the whole environmentally relevant pH region.