pH of Dihydrogenphosphate-Anion H2PO4-

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Acrobat
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pH of Dihydrogenphosphate-Anion H2PO4-

Post by Acrobat »

H2PO4- c=0.001 pKa1=7.21 pKa2=12.67; pH with the Ph-calculator resulted in pH=5.11;

The same calculation with pKb=11.87 resulted in pH=7.027;

I think these two results should be the same? :?
Where is the error?
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