How do you calculate Rf values GCSE?
Keeping this in view, what are the RF values?
RF value (in chromatography) The distance travelled by a given component divided by the distance travelled by the solvent front. For a given system at a known temperature, it is a characteristic of the component and can be used to identify components.
Also, what is RF calculation? The amount that each component of a mixture travels can be quantified using retention factors (Rf). The retention factor of a particular material is the ratio of the distance the spot moved above the origin to the distance the solvent front moved above the origin.
Beside above, how are RF values useful?
The farther a compound travelled, the larger it's Rf value. You can use this technique to compare all sorts of compounds in a lab. You can also identify or narrow down compounds by spotting a known compound, and looking to see which of your unknown compounds have the same Rf value as your known test spot.
What is a good RF value?
By definition, Rf values are always less than 1. An Rf value of 1 or too close to it means that the spot and the solvent front travel close together and is therefore unreliable. Another run must be made using a less polar solvent to improve the separation.