A protic solvent has a hydrogen atom bound to an oxygen (as in a hydroxyl group), nitrogen (as in an amine group), or fluoride (as in a fluoride group) (as in hydrogen fluoride). Any solvent that contains a labile H+ is referred to as a protic solvent. Solvent molecules rapidly supply protons (H+) to solutes, commonly through hydrogen bonding. The most frequent protic solvent is water.