questions at the bottom of the page: Help to answer # 1: We picked hexane because it is the most non polar solvent. For the mixed solvent we chose 5:5 because it had the most movement during our chromatogrphy test therefore it gave us the most clear results. 5. How do the bonds within the molecule affect the Rf? Solvents for Parts 1 and 2 Hazards Complete before coming to lab. Compound Bond-line structure hexanes dichloromethane CI Cl ethyl acetate ethanol OH Solution 1. The solvent is choosen as we get maximum movement and separation of components in this solvent. 2. Rf = distance travelled by solute/distance travelled by the solvent. Rf for benzoin = 3/24 = 0.125 Rf for benzil = 11/24 = 0.458 Rf for naphthalene = 20/24 = 0.833 Rf for 9-fluorenone = 10/24 = 0.417 3. For the unknown compare the Rf values, the ones where Rf matches is the identity of the compound. 4. The solvent amount for tlc is amount in which the plate touches the solvent layer but the spots are above the level. 5. The more polar compound move solwest on the column and the less polar compounds move the fastest on the tlc plate in the given mobile phase solvent system. .

1. questions at the bottom of the page:
Help to answer # 1: We picked hexane because it is the most non polar solvent. For the mixed
solvent we chose 5:5 because it had the most movement during our chromatogrphy test therefore
it gave us the most clear results.
5. How do the bonds within the molecule affect the Rf?
Solvents for Parts 1 and 2 Hazards Complete before coming to lab. Compound Bond-line
structure hexanes dichloromethane CI Cl ethyl acetate ethanol OH
Solution
1. The solvent is choosen as we get maximum movement and separation of components in this
solvent.
2. Rf = distance travelled by solute/distance travelled by the solvent.
Rf for benzoin = 3/24 = 0.125
Rf for benzil = 11/24 = 0.458
Rf for naphthalene = 20/24 = 0.833
Rf for 9-fluorenone = 10/24 = 0.417
3. For the unknown compare the Rf values, the ones where Rf matches is the identity of the
compound.
4. The solvent amount for tlc is amount in which the plate touches the solvent layer but the spots
are above the level.
5. The more polar compound move solwest on the column and the less polar compounds move
the fastest on the tlc plate in the given mobile phase solvent system.