1.Why would it be important to place the same amount of asolution in the polarimeter tube when measuring optical rotation asthe amount of solvent when measuring theblank?
a. Only a certain volume of liquid can be placed in apolarimeter tube.
b.So the path length can be easily converted to mL\'s whencalculating optical rotation.
c. So the density of the blank can be added to that of thesolution when calculating optical rotation.
d. None of the answers shown are correct.
e. Biots law, used to calculate optical rotation, requires thatthe volume of the blank be subtracted from that of the solution toarrive at a proper density value.
2. The optical rotation of a sample composed of only L-alanineis determined to be [α]obs = 0.33°. If the cell path length was 1.2dm and the concentration of L-alanine in the sample was 1.3 g/mlwhat is the specific observed rotation?
3. A mixture of equal amounts of two enantiomers ___________
a. optically active
b.its called a racemic mixture
c. implies that enantiomers are meso form
d. racemic optically active
e. all answers are incorrect
4. Suppose a student is measuring the optical rotation of a0.541 M pure sample of (S)-(–)-limonene. The path length is 6.51cm. What optical rotation should the student expect to measure?(S-(–)-limonene [α]D = –122.1°)
