# Rf values

posted by .

Question: Consider a sample that is a mixture composed of biphenyl, benzoic acid and benzyl alcohol. The sample is spotted on a TLC plate and developed in a dichloromethane-cyclobutane solvent mixture. Predict the relative Rf values for the three components in the mixture. (Hint: See Table 19.3 which gives elution sequence for compounds.)

My answer: I understand the order of Rf values and speed of travel. Seems like a guesstimate is in order as I'm not given any information about specific values. How about: Benzoic acid Rf about = .25; benzyl alcohol about = .50; biphenyl Rf about = .90.

Sheryl

Rf value defined as the distance travelled by the elute divided by the distance travelled by the solvent

Rf value defined as the distance travelled by the elute divided by the distance travelled by the solvent

Rf value defined as the distance travelled by the elute divided by the distance travelled by the solvent

## Similar Questions

1. ### TLC purity

Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which the Rf value is 0.95, is observed. Does this indicate that the unknown material is a pure compound?
2. ### Sample purity

Question: A student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf value is 0.05, is observed. Is the unknown a pure compound?
3. ### Organic Chem.

When a tlc plate was developed the solvent front ran off the top of the plate, why?
4. ### science(chem)

Consider the following errors that could be made when running the TLC. Indicate what should be done to correct the error. a) A 2 component mixture containing 1-octene and 1,4- dimethylbenzene gave only 1 spot with and Rf value of 0.95. …
5. ### science (chem)

consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and developed in a methylene chloride cyclohexane mixture. Predict the relative Rf values for the three components …
6. ### science (chem) Rf values

consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and developed in a methylene chloride cyclohexane mixture. Predict the relative Rf values for the three components …
7. ### Chemistry/ OChem

Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error. a) a two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of .95. …
8. ### Chemistry

Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error. a) a two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of .95. …
9. ### Chemistry

Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error. a) a two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of .95. …
10. ### ochem

Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. Predict the order of elution of the components in this mixture on the TLC plate when solvent system a, b or c is used. a)Cyclohexane: Methylenechloride:100%:0% …

More Similar Questions