Question

Please i need number 2 and 3 answered. Thank you !

Please I need a thorough explanation. What causes some molecules to rotate light? Explain in your own words. Discuss your observations in the polarimetry part of the lab. How could you know the molecules are optically active just by looking at the structure? (If you have molecular structure a pic would be great). How does the concentration, purity, and identity of the substance effect the results?

Answer 1

1) The aymmetric present in the asymmetric molecule causes it to rotate light. The chiral molecules rotate light.

2) We observe that the plane of polarized light will be rotated either clock wise or anticlock wise direction by some molecules. And some other molecules will not affect to direction of polarization. The molecule is optically active if it rotates plane polarized light either clock-wise or anticlock wise direction. If a molecule does not posses a mirror plane or center of symmetry or axes of rotation...i.e the molecule should not posses any symmetry element then it is optically active.

3) The amount of rotation of plane polarized light increases with increase in concentration and purity.