Which May Be Used to Prepare a Buffer Having a PH

question 37

Multiple Choice

Which may be used to prepare a buffer having a pH of 8.8? K_a = 7 × 10^-3 for H₃PO₄; 8 × 10^-8 for H₂PO₄^-; 5 × 10^-13 for HP O₄^2-

• A)NaH₂PO₄ only
• B)NaH₂PO₄ and Na₂HPO₄
• C)Na₃PO₄ and Na₂HPO₄
• D)NaHPO₄ and H₃PO₄
• E)H₃PO₄ and Na₃PO₄

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