Phosphoric acid is a triprotic acid with the p?a values p?a1=2.148, p?a2=7.198, and p?a3=12.375.   You wish to prepare 1.000 L of a 0.0400 M phosphate buffer at pH 7.800. To do this, you choose to mix the two salt forms involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture?   What other combination of phosphoric acid and its salts could be mixed to prepare this buffer? (select as many as are true)   H3PO4 and NaH2PO4   Na2HPO4 and Na3PO4   NaH2PO4 and Na3PO4   H3PO4 and Na2HPO4   H3PO4 and Na3PO4

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Chapter16: Acid-base Equilibria
Section: Chapter Questions
Problem 16.121QP: The equilibrium equations and Ka values for three reaction systems are given below....
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Phosphoric acid is a triprotic acid with the p?a values p?a1=2.148, p?a2=7.198, and p?a3=12.375.

 

You wish to prepare 1.000 L of a 0.0400 M phosphate buffer at pH 7.800. To do this, you choose to mix the two salt forms involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture?

 

What other combination of phosphoric acid and its salts could be mixed to prepare this buffer? (select as many as are true)

 

H3PO4 and NaH2PO4

 

Na2HPO4 and Na3PO4

 

NaH2PO4 and Na3PO4

 

H3PO4 and Na2HPO4

 

H3PO4 and Na3PO4

Please answer very soon will give rating surely

 

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