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Dissociation constant

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Description of key information

The dissociation constant of the mixture of ortho toluene sulphonamide and para toluene sulphonamide, pKa is 10.3.

Key value for chemical safety assessment

pKa at 20°C:

Additional information

Read across from:

70-55-3, Dissociation constant, Ramsamoedj, 2011, rs

88-19-7, Dissociation constant, 2002, CERI ,rs


The dissociation constant of ortho toluene sulphonamide, pKa is 10.18.

The dissociation constant of para toluene sulphonamide is 10.5.

These data are in good agreement considering the degree of uncertainty.

The difference in structure of the substances is aspected not to influence the dissociation constant.