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Measurement must now be taken of each spot on both plates so that an Rf value may be calculated for each. Rf = \(\frac{\text{distance traveled by substance}}{\text{distance traveled by solvent}}\) Remember, distances are measured from the lower line of the chromatogram, *not the lower edge*. All distances are to be measured in centimeters (cm) and tenths of centimeters (millimeters) so that each measurement is recorded with 2 significant figures. (Example – 3.7 cm) When calculating the Rf values only 2 significant figures should be recorded (example – Rf = 0.63). Please note that even though the substance distance and... **Table Showing the Names of the Compounds/Samples and Their Calculated Rf Values** | Samples | Distance Compound Travelled (cm) | Distance Solvent Travelled (cm) | Rf Value | |--------------|----------------------------------|---------------------------------|----------| | Caffeine | 0.8 cm | 4.8 cm | 0.17 | | Phenacetin | 2.8 cm | 4.8 cm | 0.58 | | Salicylamide | 3.9 cm | 4.8 cm | 0.81 | | Unknown #28 | 0.5 cm | 4.8 cm | 0.10 | In this table, the Rf value (Retention factor) is a ratio used in chromatography to quantify how far a compound travels relative to the solvent. It is calculated by dividing the distance the compound travels by the distance the solvent travels. The compounds listed here include Caffeine, Phenacetin, and Salicylamide, along with an unknown sample labeled as #28.

Measurement must now be taken of each spot on both plates so that an Rf value may be calculated for each. Rf = \(\frac{\text{distance traveled by substance}}{\text{distance traveled by solvent}}\) Remember, distances are measured from the lower line of the chromatogram, *not the lower edge*. All distances are to be measured in centimeters (cm) and tenths of centimeters (millimeters) so that each measurement is recorded with 2 significant figures. (Example – 3.7 cm) When calculating the Rf values only 2 significant figures should be recorded (example – Rf = 0.63). Please note that even though the substance distance and... **Table Showing the Names of the Compounds/Samples and Their Calculated Rf Values** | Samples | Distance Compound Travelled (cm) | Distance Solvent Travelled (cm) | Rf Value | |--------------|----------------------------------|---------------------------------|----------| | Caffeine | 0.8 cm | 4.8 cm | 0.17 | | Phenacetin | 2.8 cm | 4.8 cm | 0.58 | | Salicylamide | 3.9 cm | 4.8 cm | 0.81 | | Unknown #28 | 0.5 cm | 4.8 cm | 0.10 | In this table, the Rf value (Retention factor) is a ratio used in chromatography to quantify how far a compound travels relative to the solvent. It is calculated by dividing the distance the compound travels by the distance the solvent travels. The compounds listed here include Caffeine, Phenacetin, and Salicylamide, along with an unknown sample labeled as #28.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Find the Rf value from given data. Thank you
Measurement must now be taken of each spot on both plates so that an Rf value may be calculated for each. Rf = \(\frac{\text{distance traveled by substance}}{\text{distance traveled by solvent}}\) Remember, distances are measured from the lower line of the chromatogram, *not the lower edge*. All distances are to be measured in centimeters (cm) and tenths of centimeters (millimeters) so that each measurement is recorded with 2 significant figures. (Example – 3.7 cm) When calculating the Rf values only 2 significant figures should be recorded (example – Rf = 0.63). Please note that even though the substance distance and...
Transcribed Image Text:Measurement must now be taken of each spot on both plates so that an Rf value may be calculated for each. Rf = \(\frac{\text{distance traveled by substance}}{\text{distance traveled by solvent}}\) Remember, distances are measured from the lower line of the chromatogram, *not the lower edge*. All distances are to be measured in centimeters (cm) and tenths of centimeters (millimeters) so that each measurement is recorded with 2 significant figures. (Example – 3.7 cm) When calculating the Rf values only 2 significant figures should be recorded (example – Rf = 0.63). Please note that even though the substance distance and...
**Table Showing the Names of the Compounds/Samples and Their Calculated Rf Values** | Samples | Distance Compound Travelled (cm) | Distance Solvent Travelled (cm) | Rf Value | |--------------|----------------------------------|---------------------------------|----------| | Caffeine | 0.8 cm | 4.8 cm | 0.17 | | Phenacetin | 2.8 cm | 4.8 cm | 0.58 | | Salicylamide | 3.9 cm | 4.8 cm | 0.81 | | Unknown #28 | 0.5 cm | 4.8 cm | 0.10 | In this table, the Rf value (Retention factor) is a ratio used in chromatography to quantify how far a compound travels relative to the solvent. It is calculated by dividing the distance the compound travels by the distance the solvent travels. The compounds listed here include Caffeine, Phenacetin, and Salicylamide, along with an unknown sample labeled as #28.
Transcribed Image Text:**Table Showing the Names of the Compounds/Samples and Their Calculated Rf Values** | Samples | Distance Compound Travelled (cm) | Distance Solvent Travelled (cm) | Rf Value | |--------------|----------------------------------|---------------------------------|----------| | Caffeine | 0.8 cm | 4.8 cm | 0.17 | | Phenacetin | 2.8 cm | 4.8 cm | 0.58 | | Salicylamide | 3.9 cm | 4.8 cm | 0.81 | | Unknown #28 | 0.5 cm | 4.8 cm | 0.10 | In this table, the Rf value (Retention factor) is a ratio used in chromatography to quantify how far a compound travels relative to the solvent. It is calculated by dividing the distance the compound travels by the distance the solvent travels. The compounds listed here include Caffeine, Phenacetin, and Salicylamide, along with an unknown sample labeled as #28.
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