What Is the Hydronium-Ion Concentration of a Buffer Solution That

question 114

Multiple Choice

What is the hydronium-ion concentration of a buffer solution that is 0.45 M Na₂HPO₄ and 0.30 M NaH₂PO₄? For H₃PO₄,Ka₁ = 6.9 × 10^-3,Ka₂ = 6.2 × 10^-8,and Ka₃ = 4.8 × 10^-13.

• A)1.0 × 10^-2 M
• B)4.6 × 10^-3 M
• C)9.3 × 10^-8 M
• D)4.1 × 10^-8 M
• E)3.2 × 10^-13 M

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