Question

Tength of the light path, and the wavelength of the A standard formula is used to convert observed into "specific rotations" Tal a physical property tl be found in tables of physical properties of chemical compounds. al- 0 - measured rotation in angular degrees c = concentration in grams per milliliter of solution = cell length in decimeters D = wavelength of light, usually the D* line of a sodium lamp T = temperature of measurement, usually 25°C As an example, the observed rotation of 10 grams sucrose in 100 ml of solution (water) was measured as: 6.5 when i was 6.5 1.0 decimeter. lajo:10 = +65 (H20) 1.0X100 : This compares with a value of 66.5 in the literature.

11 degrees at 10cm
rotation of sucrose is 1
C=.171

Answer 1

optical rotation is 4 found as : +65 CH,6) 25 Literature value also reported as Els = +66.5 = +66.5 Experimental Theoriticent and Literature values are comparable. 11° 0- e = 10cm = I am. C = 0.171 [x]" allon 464.79 =+64-7 Ix0.171