Asked Dec 29, 2019

Using a 300 MHz NMR instrument:
a. How many Hz downfield from TMS is a signal at 2.5 ppm?
b. If a signal comes at 1200 Hz downeld from TMS, at what ppm does it occur?
c. If two signals are separated by 2 ppm, how many Hz does this correspond to?


Expert Answer

Step 1

NMR instrument:

a). To find observed chemical shift from TMS:

The formula is

Chemistry homework question answer, step 1, image 1
Step 2

By substituting all the values in the above formula, we get observed chemical shift downfield from TMS as 750 Hz.

Chemistry homework question answer, step 2, image 1
Step 3

b). To find chemical shift in ppm:

By substituting all the val...

Chemistry homework question answer, step 3, image 1

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