A Handbook States That to Prepare a Particular Buffer Solution

question 84

Multiple Choice

A handbook states that to prepare a particular buffer solution mix 39.0 mL of 0.20 M aqueous NaH₂PO₄ with 61.0 mL of 0.20 M aqueous Na₂HPO₄.What will be the pH of this buffer? For phosphoric acid Ka₂= 6.2 × 10^-8

• A)7.2
• B)7.4
• C)7.0
• D)6.8
• E)6.6

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