Difference between revisions of "Retention Factor"
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===Equation=== | ===Equation=== | ||
: [[Retention Factor]] = (distance moved by [[chemical]])/(distance moved by [[solvent]]) | : [[Retention Factor]] = (distance moved by [[chemical]])/(distance moved by [[solvent]]) | ||
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| + | <math>R_f = \frac{d_c}{d_s}</math> | ||
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:Where: | :Where: | ||
:R<sub>f</sub> = [[Retention Factor]] | :R<sub>f</sub> = [[Retention Factor]] | ||
:d<sub>c</sub> = distance moved by the [[chemical]] | :d<sub>c</sub> = distance moved by the [[chemical]] | ||
:d<sub>s</sub> = distance moved by the [[solvent]] | :d<sub>s</sub> = distance moved by the [[solvent]] | ||
Revision as of 21:34, 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