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At 25Cphosphoric acid,H3PO4, has the following equilibrium constants: H 3 P O 4 ( a q ) + H 2 O ( l ) H 3 O + ( a q ) + H 2 P O 4 ( a q ) K a 1= 7.

At 25∘Cphosphoric acid,H3PO4, has the following equilibrium constants:

H3PO4(aq)+H2O(l)H3O+(aq)+H2PO4(aqKa1=7.5×103

H2PO4(aq)+H2O(l)H3O+(aq)+HPO42(aqKa2=6.2×108

HPO42(aq)+H2O(l)H3O+(aq)+PO43(aq)  Ka3=4.2×1013


What is the pH of a solution of 0.400 M KH2PO4, potassium dihydrogen phosphate?

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2 comments
  • hope it is helpful. thank you :-)
    • elonsky1
    • Jul 19, 2016 at 10:03pm
  • not helpful. the model is wrong
    • cornel
    • Jul 20, 2016 at 4:09pm

The solution contains the ampholyte H... View the full answer

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