Calculadora de Valor Rf — Formula
## Retention Factor (Rf) in TLC
The Rf value describes how far a compound moves relative to the solvent front in thin-layer chromatography. It is characteristic of a compound under specific conditions.
### Formula
**Rf = distance traveled by solute / distance traveled by solvent front**
Rf values range from 0 (compound stays at origin) to 1 (compound moves with solvent front). Polar compounds have lower Rf values on silica plates because they interact more strongly with the polar stationary phase.
The Rf value describes how far a compound moves relative to the solvent front in thin-layer chromatography. It is characteristic of a compound under specific conditions.
### Formula
**Rf = distance traveled by solute / distance traveled by solvent front**
Rf values range from 0 (compound stays at origin) to 1 (compound moves with solvent front). Polar compounds have lower Rf values on silica plates because they interact more strongly with the polar stationary phase.
Exemplo Resolvido
A spot on a TLC plate travels 3.5 cm while the solvent front reaches 7.0 cm.
- Rf = 3.5 / 7.0 = 0.500