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July 31, 2014

Homework Help: AP CHEMISTRY

Posted by NIKITA on Wednesday, February 15, 2012 at 5:05pm.

Phosphoric acid is triprotic acid (three ionizable hydrogens). The values of its stepwise ionization constants are Ka1= 7.5E-5, Ka2= 6.2E-8, and Ka3= 4.2E-13

1) Write the chemical equation for the first ionization reaction of phosphoric acid with water

2)Write the equilibrium constant expression (Ka1) for this reaction.

3)What would be the pH of a solution when [H3PO4]= [H2PO4-]?
(Note: pH= -log[H3O+])

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