The observed rotation for 100 mL of an aqueous solution containing 1 g of sucrose, placed in a 2-decimeter sample tube, is +1.33° at 25°C.What is the specific rotation of sucrose?

Question

Quizplus · Accepted Answer

The specific rotation $[α]$ is calculated using the formula $[α] = \frac{α}{l \cdot c}$, where $α$ is the observed rotation (in degrees), $l$ is the path length of the sample cell (in decimeters), and $c$ is the concentration of the solution in grams per 100 mL. Given $α = +1.33°$, $l = 2$ dm, and $c = 1$ g/100 mL, the specific rotation is $[α] = \frac{+1.33°}{2 \cdot 1} = +66.5°$.

The Observed Rotation for 100 ML of an Aqueous Solution