How Many Millimoles of NaOH or HCl Must Be Added

question 16

Multiple Choice

How many millimoles of NaOH or HCl must be added to 500.0 mL of 0.250 M NaO₂CCO₂H to prepare a pH 3.90 buffer? Assume no change in volume.pK₁ = 1.250 and pK₂ = 4.266.

• A)37.65 mmol NaOH
• B)87.35 mmol HCl
• C)124.7 mmol HCl
• D)0)30 mmol NaOH
• E)The answer cannot be calculated from given information.

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