The PK_a of a Weak Acid Was Determined by Measuring

question 62

Multiple Choice

The pK_a of a weak acid was determined by measuring the pH of a solution containing the weak acid at 0.40 M and its conjugate base at 0.60 M. The measured pH was 7.8. What is the pK_a of the weak acid?

• A)8.0
• B)7.8
• C)7.6
• D)7.0
• E)7.4

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