Acid Dissociation Constants for Phosphoric Acid Are Given Below A Buffer with a PH = 7

Acid dissociation constants for phosphoric acid are given below. $\begin{array}{|l|l|l|l|}\hline & \mathrm{K}_{\mathrm{a} 1} & \mathrm{~K}_{\mathrm{a} 2} & \mathrm{~K}_{\mathrm{a} 3} \\\hline \mathrm{H}_{3} \mathrm{PO}_{4} & 7.5 \times 10^{-3} & 6.2 \times 10^{-8} & 4.8 \times 10^{-13} \\\hline\end{array}$ A buffer with a pH = 7.4 can best be made by using

A) H₃PO₄ and NaH₂PO₄.
B) NaH₂PO₄ and Na₂HPO₄.
C) Na₂HPO₄ and Na₃PO₄.
D) only NaH₂PO₄.
E) only Na₂HPO₄.

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