Butanoic Acid Contributes to the Rancid Odor of Spoiled Butter

Multiple Choice

Butanoic acid contributes to the rancid odor of spoiled butter. Calculate the acid ionization constant for butanoic acid if a 0.155 M solution is 1.15% ionized. The abbreviated structural formula for butanoic acid is CH₃CH₂CH₂COOH.

A) 5.1  10^3
B) 1.8  10^3
C) 1.2  10^2
D) 2.1  10^5
E) 1.5  10^5