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Butyric Acid Is Responsible for the Odor in Rancid Butter

Question 96

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) None of these choices is correct.

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