For easy reference the definitions of pka and pkb are below
pkw is a useful constant defining the equilibrium value of pure water. It is defined in exactly the same way as pka and pkb and has a value of 14. It relates pka and pkb in a simple relationship
Summary
Note that this is determined in exactly the same way as pka except without the general acid HA. For a reminder of how pka was determined then click here
The relationship of pka, pkb and pkw is simple. By simply adding pka and pkb together the value of pkw is obtained, this means that pka and pkb will always equal 14 and so relative acidities can be compared easily. As a result of the simplicity of the relationship pkb values are not often quoted instead preferring to tabluate and quote pka values. Therefore a low pka value will mean a strong acid and a high pka value will mean a strong base.
Summary
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