Is the value of diluent coefficient Rr= (A) Distance covered by solute Distance covered by the solvent (B) Distance covered by solvent Distance covered by the solute (C) Both (A) and (B) (D) None ctness
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Subject:
Chemistry -
Author:
eloiseambx -
Created:
1 year ago
Answers 1
Answer:
RF Value
What is RF Value?
The Rf (retardation factor) value is the ratio of the solute’s distance travelled to the solvent’s distance travelled.
The word comes from chromatography when it was discovered that a given component will always travel the same distance in a given solvent under the same conditions.
The Rf value is a physical constant for organic molecules that can be used to verify a molecule’s identity. Only if the chromatographic settings below are also constant from one trial to the next does the Rf for a substance remain constant. Because these variables are challenging to maintain consistency from experiment to experiment, relative Rf values are commonly used. “Relative Rf” denotes that the results are provided in comparison to a standard, or that the Rf values of compounds run on the same plate at the same time are compared.
Table of Contents
RF Value Explanation
Why Do We Need the RF Value?
Calculation of RF Value
Factors affecting Rf values
Frequently Asked Questions – FAQs
RF Value Explanation
The stationary phase in paper chromatography is water molecules found in the pores of the filter paper, whereas the moving phase is a solvent such as hexane, toluene, acetone, or a mixture of solvents such as methanol-water mixture. As the moving phase passes through the area where the sample has been adsorbed, it dissolves the components more or less quickly, depending on their solubility, and carries them with it as it moves across the spot.
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