In chemistry, I am not sure what "pkw" stands for.© BrainMass Inc. brainmass.com September 25, 2018, 1:32 am ad1c9bdddf - https://brainmass.com/chemistry/acids-and-bases/discussing-pkw-variable-42560
The auto-dissociation reaction for water simplistically is H20-----> H(+) + OH(-)
Kw = ...
This solution provides a clear explanation of the meaning of this particular variable used in chemistry. This solution is about 70 words in length.