How can I filter on pK or pKa values of a substance?

Dissociation constant, also called dissociation exponent (pK or pKa, for acids) can be calculated by following the below steps:

How

From Quick Search

1. Draw the substance of interest and search.
2. Go to substance results and open the filter for ‘Available data’, click 'More' to find and 'Limit to' ‘Dissociation exponent’, as shown below.

OR

From Query Builder

1. Draw the structure of interest.
2. Using 'AND' Boolean operator, combine it with the field ‘Dissocation Exponent’ and choose ‘Find any’ for it.
3. Search for substances.
4. Export the results in Excel format to extract the pK values.