A Buffer Is Prepared by Adding 1

question 32

Multiple Choice

A buffer is prepared by adding 1.50 × 10² mL of 0.250 M NaOH to 2.50 × 10² mL of 0.350 M weak acid,HB.The solution is diluted to 1.00 L.If the pH of the resulting solution is 6.55,what is the pK_a of the weak acid?

• A) 6.55
• B) 6.67
• C) 6.87
• D) 6.92
• E) 7.20

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