Ecdysone is an insect hormone that controls molting. in a polarimetric experiment, 70.00 mg of ecdysone was dissolved in 10.00 ml of chloroform, and the solution was placed in a 2.0 cm path-length cell. the optical rotation was measured at 20 °c using the yellow sodium d line near 589 nm wavelength. if the rotation observed was of +0.087°, calculate the 20davalue for ecdysone.

The specific rotation is 62 °.mL . dm⁻¹ g⁻¹.

Explanation:

In a polarimetric experiment, we can calculate the specific rotation () for ecdysone using the following expression:

where,

α is the angle of rotation

l is the path length in decimeters (2.0 cm = 0.20 dm)

c is the concentration in g/mL

Concentration is:

Then,

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