The formula to calculate the specific rotation is:
\[ \text{SR} = \frac{a}{y \times l} \]
Where:
Specific rotation is defined as "the change in orientation of monochromatic plane-polarized light, per unit distance-concentration product, as the light passes through the sample of a compound in solution."
Let's assume the following:
Step 1: Calculate the specific rotation:
\[ \text{SR} = \frac{25}{0.5 \times 1} = \frac{25}{0.5} = 50 \text{ deg*mL/(g*dm)} \]
Therefore, the specific rotation is 50 deg*mL/(g*dm).