Question

When a 300 mm long tube filled with 60 cc of sugar solution produces an optical rotation of 9^o, find the quantity of sugar in the solution (ρ for sugar is 6^​o/cm).

Answer 1

1. The formula for optical rotation is:

$$\begin{gathered} \alpha =\frac{\left[\alpha \right]}{c\times l}where\left[\alpha \right]=specificrotation \\ c=concentrationandl=pathlength \end{gathered}$$

2. c = $\frac{6}{9\times 3dm}=0.22g/ml$

3. 1 cc = 1ml

1000 cc has 0.22 g of sugar
60 cc has = 0.132 g of sugar.