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Dissociation constant

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Description of key information

Key value for chemical safety assessment

Additional information

Dissociation of DMA category members

The percentage of neutral (i.e. amine) and protonated forms of DMA category members can be calculated from the pKa of 9.78 (25 °C; identical for all category members)for a given pH using the Henderson-Hasselbach equation.

 

Percentage of neutral and protonated DMAs at pH 4, 7 and 9

pH

% amine

% protonated

4

0.00017%

99.99983%

7

0.2%

99.8%

9

14.2%

85.8%