?6. In Part III of Experiment 9, the optical rotation of naproxen is measured in a polarimeter. If the observed rotation ( ? D ) from a solution prepared by dissolving 500 mg of naproxen in 25 mL of 95% ethanol and measured in a sample tube 15.0 cm (1.50 dm) in length is +1.98?, what is the specific rotation , [?] D , of naproxen?[?]T = ?/lc
[?]T = specific rotation in degrees ( is the wavelength of light used for the observation,
usually 589 nm; T is the temperature in oC)
? = observed rotation in degrees.