Rf value changes with every experiences..... it depends on what was your solvant, the room température, the chromatograph you used..... that's why you wont find Rf tables in organic chemistry books
Will acetaminophen or ibuprofen have a higher Rf if you carry out a TLC separation of on a silica gel using a non-polar developing solvent?
Acetaminophen will have Rf value of about 0.4 and ibuprofen will have Rf value of about 0.6 if the non polar solvent used is ethanol. ...
What are the Rf values for pure aspirin and salicylic acid With workings shown so i can understand thank you?
The Retardation Factor (RF) value of aspirin is 0.56. The RF value of salicyclic acid is 0.654. Although workings cannot be shown here, a more detailed explanation can be found on the RSC website. ...
Asked in Ibuprofen, Painkillers, Anti-Inflammatories
What is the rf value of Ibuprofen?
That depends on many factors including the elution solvent used, the type of TLC plate used, etc.. When using .5% of acetic acid in ethyl acetate as your elution solvent and on a plastic backed plate, the Rf-value should be around 79.82% ...
Asked in Chemistry
What are the TLC Rf values influencing factors?
Response Details: 1) factor that affects the Rf value of TLC is the polarity of the solvent. If the solvent is too polar all of the compounds can run right up the plate resulting in poor separation. 2) The RF value is used to established the identity of the spots of TLC plate. 3) The RF value is ratio of the distance the solvent travels to the distance compound travels. 4) The factors can affect RF values. The absorbent uniformity on the thin layer...
Asked in Chromatography
An experiment was performed in lab that was supposed to produced aspirin. How could chromatography be used to tell if aspirin was acually the product of the reaction?
i would recommend using high performance liquid chromatography or the common thin layer chromatography using a spot of the sample and a spot of dissolved aspirin to compare the Rf-value or relative retention times of the 2 spots to determine if you have aspirin ...
Will acetaminophen or phenacetin have a higher Rf if you carry out a TLC separation of on a silica gel using a non-polar developing solvent?
phenacetin will have the higher Rf value because it is less polar. Nonpolar molecules travel more quickly through silica gel. ...
Asked in Chemistry, Elements and Compounds
A compound has a very high Rf value in a polar solvent what can you say about its molecular structure?
Rf Value - It tells you the affinity that the compound has to the solvent...High Rf = little or no polar groups and low Rf = more polar groups. Question: In TLC (thin-layer chromatography) when the compound has a high Rf the solvent is: a. less polar b. Is more polar Answer: a. less polar ...
Asked in Botany or Plant Biology
What does Rf value tell you about the solubility of a pigment?
Rf value is an indicator of the solubility of a pigment. Identical molecules means of two pigments has the same Rf value. Small Rf value means less soluble and pigments with Rf value near to one means highly soluble. ...
Asked in Laboratory Testing
Is benzophenone polar or non polar?
If you'll take a look at its structure benzophenone is polar but during our laboratory we were able to determine if it's polar or non-polar by TLC. The TLC plate was developed in a mixture of petroleum ether and ethyl acetate with a 9:1 ratio respectively. This would mean that the solvent used is non-polar due to the large amount of petroleum ether. Finally our group was able to determine the Rf value of benzophenone and we found out that it...
Asked in Organic Chemistry
Do identical Rf compounds mean they have the same structure?
Rf is a value that is usually seen in chromatography (such as thin-layer chromatography, or TLC). It is a measure of how far the compound has traveled along the stationary phase. This distance is affected by the compounds affinity to the stationary phase (the TLC plate) and its affinity to the mobile phase (the solvent). Generally this directly relates to the polarity of the compound, but other factors may influence this. Since similar compounds (in structure) also have similar dipole moments (polarity), similar...
Asked in Science
How do you determine which color moved the fasted due to Rf value?
The Rf value is calculated on the chromatography strip (usually TLC). It is an arbitrary value so its number doesn't really mean much outside of your experiment... The results will only tell you what color moved the furthest... So the greatest the Rf value, the further the color went and visa versa. The fastest moving color would have to be observed during the experiment, but you can assume that the lightest dye would move the fastest/furthest when you disregard polarity of the...