Question

1. Polarimetry can be used to: (more than one answer may be correct)

-measure the rotation of plane polarized light, but no further analysis can be carried out using the sample.

-separate a pair of optical isomers.

-find out which isomer of a chiral product you have made, by comparing the specific rotation to literature values for the same solvent, temperature, and wavelength.

-determine the optical purity of the purified product from an enantioselective reaction.

-determine the optical purity of a mixture containing three pairs of optical isomers.

2.

SAFETY: When setting up a polarimetry experiment using a Zeiss polarimeter, you should: (more than one answer may be correct):

-Place the cell on the worktop so that it can roll around.

-Make up your solution in the cell.

-Turn on the polarimeter and leave it to warm up for 10-15 minutes.

-Make up the solution in the fume cupboard if using a volatile solvent.

-Prepare your solution next to the polarimeter.

Answer 1

Ans. 1)Polarimetry can be used to -

-measure the rotation of plane polarized light, but no further analysis can be carried out using the sample.

-find out which isomer of a chiral product you have made, by comparing the specific rotation to literature values for the same solvent, temperature, and wavelength.

Ans.2) SAFETY: When setting up a polarimetry experiment using a Zeiss polarimeter, you should-

-Place the cell on the worktop so that it can roll around

-Turn on the polarimeter and leave it to warm up for 10-15 minutes.

-Make up the solution in the fume cupboard if using a volatile solvent.

-Prepare your solution next to the polarimeter.