Answered: What is the area under the NMR signal…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

What is the area under the NMR signal proportional to?

Expert Solution

Step 1

NMR spectroscopy

The principle behind nmr spectroscopy is every nucleus with a spin generates magnetic field.

In presence of an external magnetic field, the spin aligns in the direction of magnetic field or opposite to the magnetic field by absorbing energy from radio frequency region.

Step 2

Peak integration

The area under the nmr signal represents the number of absorbing protons.

These are the protons with that resonance represents.

By integrating the peak, the number of chemically equivalent protons can be found.

Integrals appear as a line over the peak.

Integration only gives the relative number of protons, not an absolute number.

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