The K_a for H₂PO₄− Is 6

question 1

Multiple Choice

The K_a for H₂PO₄− is 6.2 × 10−⁸.What volume of 0.10 M NaOH must be added to 0.50 L of 0.30 M H₂PO₄− to make a pH = 7.50 buffer?

• A) 0.10 L
• B) 0.13 L
• C) 0.25 L
• D) 0.51 L
• E) 0.99 L

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