NMR spectroscopy

Question 1

What are the 2 things that H nucleus can do while in magnetic field

Answer 1

Align with the external applied field
OR
Align against the external applied field

Question 2

How does NMR spec work

Answer 2

At a specific applied magnetic field strength, energy (radio waves frequencies) is required to “Flip” a 1H nucleus from one “spin state” into the other.

The higher the magnetic field the higher energy is required.

Question 3

What are the 2 different types of NMR machines

Answer 3

Fixed radiofrequency of 400MHz or a 600MHz which provide the same results

Question 4

Is NMR quantitative or qualitative

Answer 4

NMR is usually run on pure compounds for qualitative analysis but since the size of the peaks in 1H NMR are proportional to the number of protons giving rise to the signal, it can also be used to determine quantitatively

Question 5

What solvents is used for proton NMR

Answer 5

CDCL3

Question 6

What equation is used to calculate the concentration of sample placed into the NMR

Answer 6

Standard integral / number of proton signals