Analytical technique Flashcards
1
Q
Define Rf value.
A
Rf value is the ratio of the distance travelled by a specific component to the distance travelled by the solvent front.
2
Q
State the mobile phase and stationary phase of gas-liquid chromatography.
A
Mobile phase: unreactive gas such as N2 and helium.
Stationary phase: non-volatile, non-polar liquid hydrocarbon bonded onto solid support.
3
Q
Define retention time.
A
The time between injection and detection in which a compound travels through a chromatography column in GLC.
4
Q
Explain why CDCl3 is a better solvent than CHCl3 for use in proton NMR.
A
CDCl3 will not give an absorption.
