| − | A '''base''' is a [[molecule]] which produces [[hydroxide]] ions when added to water (according to the Arrhenius definition), which accepts H<sup><small>+</small></sup> [[ion]]s in a [[chemical reaction]] (according to the [[Bronsted-Lowry theory|Bronsted-Lowry]] definition), or which donates an [[electron]] pair in a reaction (according to the Lewis definition). Bases have a bitter taste and turn red [[litmus paper]] blue. Bases feel slippery when dissolved in water. Most strong bases contain a [[hydroxide]] ion. Bases are indicated by numbers from 1 to under 7 on the pH scale, and are the opposite of [[acids]]. | + | A '''base''' is a [[molecule]] which produces [[hydroxide]] ions when added to water (according to the Arrhenius definition), which accepts H<sup><small>+</small></sup> [[ion]]s in a [[chemical reaction]] (according to the [[Bronsted-Lowry theory|Bronsted-Lowry]] definition), or which donates an [[electron]] pair in a reaction (according to the Lewis definition). Bases have a bitter taste and turn red [[litmus paper]] blue. Bases feel slippery when dissolved in water. Most strong bases contain a [[hydroxide]] ion. Bases are indicated by numbers from above 7 to 14 on the pH scale, and are the opposite of [[acids]]. |