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Students can use an NMR spectrometer and an internal standard to determine the concentration of the primary ingredient, either acetone or ethyl acetate, in a commercial nail polish remover, a familiar product. They interpret qualitatively and quantitatively. Both the standard and the analyte generate a signal proportional only to the number of protons present, that is the number of molecules present multiplied by number of protons on each molecule. Students must choose an analyte peak. Determining detector response factors is not necessary.