Modern Analytic Techniques Flashcards
1
Q
How does chromatography work?
A
Different substances have different solubilities in mobile phase and stationary phase
2
Q
phases of HPLC
A
Mobile: liquid
Stationary: solid silica
3
Q
phases of gas chromatography
A
Mobile: inert gas- nitrogen
Stationary phase: liquid
4
Q
why would a singlet peak be present on a high resolution nmr
A
because the adjacent carbon has no protons attached to it
5
Q
why is TMS used in nmr? (5)
A
- its signal is away from all the others
- it only gives one signal
- it is non-toxic
- it is inert
- It has a low boiling point and so can be removed from sample easily
6
Q
how can you determine the mr value from a mass spectrum
A
you look at the peak that has the highest m/z value (furthest to the right)
