Difference between revisions of "Retention Factor"
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===Equation=== | ===Equation=== | ||
| − | + | [[Retention Factor]] = (distance moved by [[chemical]])/(distance moved by [[solvent]]) | |
<math>R_f = \frac{d_c}{d_s}</math> | <math>R_f = \frac{d_c}{d_s}</math> | ||
| − | + | Where: | |
| − | + | ||
| − | + | R<sub>f</sub> = [[Retention Factor]] | |
| − | + | ||
| + | d<sub>c</sub> = distance moved by the [[chemical]] | ||
| + | |||
| + | d<sub>s</sub> = distance moved by the [[solvent]] | ||
Revision as of 21:35, 13 May 2019
Key Stage 4
Meaning
The Retention Factor is a ratio of how far a chemical moves along the paper compared to how far the solvent moves along the paper in a chromatography experiment.
About Retention Factors
- Each chemical has a Retention Factor (Rf number).
- The larger the Retention Factor the greater the force of attraction experienced by the chemical to the paper. The chemical is 'retained' in place.
- Rf numbers are unique to each chemical and can be used to separate and identify the chemical.
Equation
Retention Factor = (distance moved by chemical)/(distance moved by solvent)
\(R_f = \frac{d_c}{d_s}\)
Where:
Rf = Retention Factor
dc = distance moved by the chemical
ds = distance moved by the solvent