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Which of the following species has the highest pKa value?  

Which of the following species has the highest pKa value?  
(A) H2PO4–
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 09. Acid-Base Equilibrium

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Posted: 08/30/2013 12:15
I don't understand why the answer isn't h3po4, doesn't it have the highest pka?
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