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Is pka always negative for a strong acid?
 

wizzkids

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It depends on where you draw the line for distinguishing a strong acid from a weak acid. This is a broad distinction. I suppose you could say if
pKa < 0
then you are definitely dealing with a strong acid,
Then you have something like oxalic acid (ethanedioic acid) which is pKa = 1 it's still pretty strong.
 

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