A student spots a black ink sample 1.5 cm from the bottom of a strip of chromatography paper and develops it in 70/30 isopropanol/water. The solvent front travels 8.0 cm from the spot. Three components are observed: blue (3.2 cm), red (5.6 cm), yellow (7.2 cm), all measured from the original spot.
What is the Rf value of the red component?
- A
1.43
- B
0.40
- C
5.6
- Dcheck_circle
0.70
Explanation
Rf = distance solute / distance solvent front = 5.6 / 8.0 = 0.70.