pKa prediction

User f6c6285e8e

07-08-2015 21:13:33

I have been using chemicalize to get some idea of the pKas for a series of chemicals.  I use the pKa graph property.  I have noticed that there are instances (I think many) where observation of this graph doesn't agree with what is labeled as the major microspecies at pH 7.4 at a different part of the properties page.  An example is BrC=1C(=O)N(C(CC)C)C(O)=NC=1C.  Any ideas?  Which should i trust, if either?   thanks