How Many Moles of Benzoic Acid, a Monoprotic Acid with K_a

question 17

Multiple Choice

How many moles of benzoic acid, a monoprotic acid with K_a = 6.4 × 10^-5, must be dissolved in 500. mL of H₂O to produce a solution with pH = 2.50?

• A) 1.6 × 10^-1
• B) 2.0 × 10^-2
• C) 7.8 × 10^-2
• D) 0.50
• E) none of these

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