Chapter 5.4, Problem 12PTS

Interpretation Introduction

Interpretation:

To calculate the specific rotation of a given molecule.

Concept Introduction:

The specific rotation $(\alpha )$ is a property of a chiral chemical compound. It is defined as the change in orientation of monochromatic plane-polarize light, per unit distance concentration product, as the light passes through a sample of a concentration in solution.

The specific rotation of a molecule can be calculated by using the formula given below.

${[\alpha ]}^T{}_{{}_{{}_{\lambda }}}=\frac{{\alpha }_{obs}(\mathrm{deg}ree)}{l(dm).C(\frac{g}{mL})}$

$\begin{array}{l}\text{alpha }\left(\text{α}\right)\text{ represents the observed rotation measured with a polarimeter}\text{.}\\ \text{ l represents the length of the sample tube}\text{. }\\ \text{C is the concentration of a solution of a pure sample}\text{.}\\ \text{λ is the wave length of the light}\text{.}\end{array}$