1.5 pts) The Rf value of compound A is 0.29 when developed in petroleum either and 0.44 when developed in dichloromethane. Compound B has an Rf value of 0.45 in petroleum either and 0.69 in dichloromethane. Which solvent would be better for separating a mixture of compounds A and B. Briefly explain your choice. What is petroleum ether

The better solvent for separating the mixture of A and B is dichloromethane

Explanation:

Petroleum ether is the mixture of hydrocarbons obtained from the petroleum distillation with a boiling range between 35 and 60°C. Is used as a solvent.

In the other hand, the best solvent for separating a mixture in TLC is the one that has the higher difference between RF's of the compounds.

The difference in RF's in dichloromethane is:

|0.44 - 0.69| = 0.25

In petroleum ether:

|0.29 - 0.45| = 0.16

That means the better solvent for separating the mixture of A and B is dichloromethane

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