The pKa's of H3PO4 are 2.0, 7.0, and 12.5. Assuming you have the sodium salts of all of the ionic forms of this compound available, answer the following questions pertaining to the preparation of 0.1 M phosphate buffer of pH = 7.6. What is the proton donor? What is the proton acceptor?

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The pKa's of H3PO4 are 2.0, 7.0, and 12.5. Assuming you have the sodium salts of all of the ionic forms of this compound available, answer the following questions pertaining to the preparation of 0.1 M phosphate buffer of pH = 7.6.

What is the proton donor?  

What is the proton acceptor?

What is the final concentration of the proton donor?  

What is the final concentration of the proton acceptor?

please explain and answer all parts, thanks

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