Chapter 13, Problem 50E

The amino acid alanine has two isomers, $\alpha$ -alanine and $\beta$ -alanine. When equal masses of these two compounds are dissolved in equal amounts of a solvent, the solution of $\alpha$ -alanine freezes at the lowest temperature. Which form, $\alpha$ -alanine or $\beta$ -alanine, has the larger equilibrium constant for ionization $\left(\text{HX}\rightleftharpoons {\text{H}}^{+}+{\text{X}}^{-}\right)$?