Butyric Acid Is Responsible for the Odor in Rancid Butter

question 71

Multiple Choice

Butyric acid is responsible for the odor in rancid butter.A solution of 0.25 M butyric acid has a pH of 2.71.What is the K_a for the acid?

• A)0.36
• B)2.4 × 10^-2
• C)7.8 × 10^-3
• D)1.5 × 10^-5
• E)1.9 × 10^-3

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