For those molecules find the number of different signals. We give you the molecular formula in order to guess what are the impurities.

In ¹H NMR spectroscopy we often have signals that are composed on many peaks (multiplet) and therefore based on the symmetry and the distance we need to try to guess where is a signal and how many there are.

In order to determine if it is an impurity it is often useful to integrate the spectrum. To integrate press the 'ALT' key and then click on the starting point and click on the ending point of the integral.

In CDCl₃, water is around 1.5ppm and CHCl₃ at 7.27.

In DMSO-d₆, water is at around 3.5 and DMSO-d₅ at 2.5..

Acetone (around 2 ppm) is often an impurity in NMR spectra. It is used to clean the NMR tubes.

If the solvent is not specified, it is CDCl₃.