Homework Help: chemistry

Posted by Jenn on Tuesday, October 28, 2008 at 1:11am.

This is for organic chem lab.
I don't understand how to calculate the relative Rf values by setting ibuprofen to 1.00. For example, my Rf value for aspirin is 0.046, so how do I calculate the Rf relative to ibuprofen (1.00)?
My experimental data for ibuprofen is 0.55 if that helps.

chemistry - Dr Russ, Tuesday, October 28, 2008 at 6:48am
In essence you need

1.00 x 0.046/0.55

imagine that the solvent front has moved 10 cm then the ibuprofen spot has moved 5.5 cm and the aspirin spot has moved 0.46 cm. So if we take the ibuprofen as Rf = 1.00 then the distances travelled by other spots are relative to this. So the Rf of the aspirin is 0.46 cm/5.5 cm (relative to ibuprofen).

Answer this Question

Related Questions

Organic Chemistry Lab - ISOLATION OF CHLOROPHYLL AND CAROTENOID PIGMENTS FROM ...
science (chem) Rf values - consider a sample that is a mixture of biphenyl, ...
organic chemistry - What will happen to the Rf values of the pigments if you ...
organic chemistry - Which has a higher Rf value Ibuprofen or mefenamic acid? ...
science (chem) - consider a sample that is a mixture of biphenyl, benzoic acid, ...
Rf values - Question: Consider a sample that is a mixture composed of biphenyl, ...
Organic Chemistry Lab - For the "ISOLATION OF CHLOROPHYLL AND CAROTENOID ...
chem - How many grams of ibuprofen contain 7.1x10^25 atoms of C? Ibuprofen is ...
Organic Chemistry Lab - For the "ISOLATION OF CHLOROPHYLL AND CAROTENOID ...
Organic Chem Lab - If I have separate solutions of the compounds benzoic acid ...

For Further Reading

First Name:
School Subject:
Answer: