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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

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%