Last week in my O Chem lab, we had to synthesize Chalcone and in obtaining the crude product, we had to use NaOH pellets to help with the reaction. After obtaining the crude product through vacuum filtration, I washed the crude product with two amounts of water to help rinse off any excess NaOH left on it. My concern is, if for any reason any NaOH was still on it when I submitted the recrystallized product for NMR, will it greatly impact the spectrum?