How Many Moles of Sodium Acetate Must Be Added to 500

question 9

Multiple Choice

How many moles of sodium acetate must be added to 500 mL of 0.25 M acetic acid solution to produce a buffer with a pH of 4.94? The pK_a of acetic acid is 4.74. You can neglect the change in volume when sodium acetate dissolves in the acetic acid solution.

• A)0.011 moles
• B)0.021 moles
• C)0.125 moles
• D)0.198 moles
• E)0.206 moles

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