5.8.1.3 chromatography

Question 1

What is a chromatography

Answer 1

A method to separate mixtures which then gives information to help identify certain substances

Question 2

Name the two phases in chromatography

Answer 2

Stationary phase- what’s not moving
Mobile phase- what is moving

Question 3

The ratio of the distance moved by a compound (centre of spot from origin) to the distance moved by the solvent can be expressed as its Rf value, what is the Rf formula?

Answer 3

Distance moved by substance /
Distance moved by solvent

Question 4

What is the difference between a compound and a pure compound

Answer 4

Compounds in a mixture may separate into different spots depending on the solvent but a pure compound will produce a single spot in all solvents