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Physical & Chemical properties

Dissociation constant

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Description of key information

Key value for chemical safety assessment

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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%