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Question- The phosphate buffer in this lab utilizes the second acidic proton from the triprotic phosphoric acid, H3PO4. The components of the buffer include a weak acid, H2PO4- and its conjugate base HPO4 2-. The Ka for the system is Ka2= 6.3e-8. For H3PO4, the first acidic proton has Ka1= 7.2e-3.

a) What is the Kb value for H2PO4-?

b) Why do we not need to worry about the basic properties of H2PO4-?

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