The order of increasing RF values in TLC is Benzil, methanol anthracene and tryphenyl.
outside are jus impurities
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
50:50 ethyl acetate and petroleum ether gives an rf value of about 0.6.You are supposed to dissolve the compound in any volatile solvent like methylene chloride or acetone.
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 compounds will typically have similar Rf values. However, there are exceptions and compounds that have different functional groups can end up having similar polarities and thus similar Rf values. TLC is usually used as an initial measure of identification. If the Rf of the reference matches the Rf of the unknown, it is likely the compounds are the same, but further investigation with other analytical techniques is necessary to confirm this.
The order of increasing RF values in TLC is Benzil, methanol anthracene and tryphenyl.
outside are jus impurities
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.
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 plate, same concentration(spotting is too weak or strong), room temperature during the mobile phase and development distance of the solvent during the mobile phase can all affect the results.5) Multiple solvent system are necessory when utilizing TLC for identification purposes.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 plate, same concentration(spotting is too weak or strong), room temperature during the mobile phase and development distance of the solvent during the mobile phase can all affect the results.5) Multiple solvent system are necessory when utilizing TLC for identification purposes.
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
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
50:50 ethyl acetate and petroleum ether gives an rf value of about 0.6.You are supposed to dissolve the compound in any volatile solvent like methylene chloride or acetone.
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 compounds will typically have similar Rf values. However, there are exceptions and compounds that have different functional groups can end up having similar polarities and thus similar Rf values. TLC is usually used as an initial measure of identification. If the Rf of the reference matches the Rf of the unknown, it is likely the compounds are the same, but further investigation with other analytical techniques is necessary to confirm this.
1, if it completely solube in the solvent, it will travel with it, right to the solvent front.
0 to -5
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%
When the Rf value is zero, it generally refers to the position of the substance in the chromatogram. This means it did not move of that origin point.