What Is the PH of a Buffer That Results When

question 5

Multiple Choice

What is the pH of a buffer that results when 0.50 mole of H₃PO₄ is mixed with 0.75 mole of NaOH and diluted with water to 1.00 L? (The acid dissociation constants of phosphoric acid are K_a1 = 7.1 × 10^-3,K_a2 = 6.2 × 10^-8,and K_a3 = 4.5 × 10^-13)

• A) 1.82
• B) 2.12
• C) 6.91
• D) 7.21
• E) 12.44

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