An oxy-acid is an acid that contains an acidic hydroxyl group, i.e., one whose acidic hydrogen is bound to oxygen. Oxy-acids include carboxylic acids and phenols, but are typically (e.g., sulfuric acid) the hydration products of acidic (nonmetal) oxides. Acids such as hydrochloric acid, whose acidic hydrogen is bound to an element other than oxygen, are termed hydracids.