An '''acid''' is a [[molecule]] that creates H<sup>+</sup> and H<sub>3</sub>O<sup>+</sup> ions in water (according to the Arrhenius definition), that donates H<sup>+</sup> [[ions]] ([[proton]]s) in a chemical reaction (according to the [[Bronsted-Lowry theory|Bronsted-Lowry]] definition), or that accepts an electron pair in a reaction(according to the Lewis definition). An acid can be neutralized by adding a [[base]]. (See: [[Acid-base reaction]])
==Properties==
==See Also==
*[[Base]]
*[[Common Acids]]
*[[pH]]