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- Base_(chemistry) abstract "For the term in genetics, see base (genetics)In chemistry, a base is a substance that, in aqueous solution, is slippery to the touch, tastes bitter, changes the color of indicators (e.g., turns red litmus paper blue), reacts with acids to form salts, and promotes certain chemical reactions (base catalysis). Examples of bases are the hydroxides of the alkali and alkaline earth metals (NaOH, Ca(OH)2, etc.). Such substances produce hydroxide ions (OH-) in aqueous solutions, and are thus classified as Arrhenius bases.For a substance to be classified as an Arrhenius base, it must produce hydroxide ions in solution—in order to do so, Arrhenius believed the base must contain hydroxide in the formula. This makes the Arrhenius model limited, as it cannot explain the basic properties of aqueous solutions of ammonia (NH3) or its organic derivatives (amines). In the more general Brønsted–Lowry acid–base theory, a base is a substance that can accept hydrogen ions (H+)—otherwise known as protons. In the Lewis model, a base is an electron pair donor.In water, by altering the autoionization equilibrium, bases give solutions with a hydrogen ion activity lower than that of pure water, i.e., a pH higher than 7.0 at standard conditions. A soluble base is called an alkali if it contains and releases OH- ions quantitatively. However, it is important to realize that basicity is not the same as alkalinity. Metal oxides, hydroxides, and especially alkoxides are basic, and counteranions of weak acids are weak bases.Bases can be thought of as the chemical opposite of acids. Bases and acids are seen as opposites because the effect of an acid is to increase the hydronium (H3O+) concentration in water, whereas bases reduce this concentration. A reaction between an acid and base is called neutralization. In a neutralization reaction, an aqueous solution of a base reacts with an aqueous solution of an acid to produce a solution of water and salt in which the salt separates into its component ions. If the aqueous solution is saturated with a given salt solute, any additional such salt precipitates out of the solution.".
- Base_(chemistry) wikiPageID "140459".
- Base_(chemistry) wikiPageRevisionID "605347401".
- Base_(chemistry) hasPhotoCollection Base_(chemistry).
- Base_(chemistry) subject Category:Bases.
- Base_(chemistry) subject Category:Chemical_compounds.
- Base_(chemistry) type Abstraction100002137.
- Base_(chemistry) type Bases.
- Base_(chemistry) type Chemical114806838.
- Base_(chemistry) type ChemicalCompounds.
- Base_(chemistry) type Compound114818238.
- Base_(chemistry) type Footing113790912.
- Base_(chemistry) type Foundation113790712.
- Base_(chemistry) type Material114580897.
- Base_(chemistry) type Matter100020827.
- Base_(chemistry) type Part113809207.
- Base_(chemistry) type PhysicalEntity100001930.
- Base_(chemistry) type Relation100031921.
- Base_(chemistry) type Substance100019613.
- Base_(chemistry) comment "For the term in genetics, see base (genetics)In chemistry, a base is a substance that, in aqueous solution, is slippery to the touch, tastes bitter, changes the color of indicators (e.g., turns red litmus paper blue), reacts with acids to form salts, and promotes certain chemical reactions (base catalysis). Examples of bases are the hydroxides of the alkali and alkaline earth metals (NaOH, Ca(OH)2, etc.).".
- Base_(chemistry) label "Base (chemistry)".
- Base_(chemistry) label "Base (chimica)".
- Base_(chemistry) label "Base (chimie)".
- Base_(chemistry) label "Base (química)".
- Base_(chemistry) label "Base (química)".
- Base_(chemistry) label "Base (scheikunde)".
- Base_(chemistry) label "Basen (Chemie)".
- Base_(chemistry) label "Zasady".
- Base_(chemistry) label "Основание (химия)".
- Base_(chemistry) label "قاعدة (كيمياء)".
- Base_(chemistry) label "塩基".
- Base_(chemistry) label "鹽基".
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- Base_(chemistry) sameAs m.011j14.
- Base_(chemistry) sameAs Q11193.
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- Base_(chemistry) sameAs Base_(chemistry).
- Base_(chemistry) wasDerivedFrom Base_(chemistry)?oldid=605347401.
- Base_(chemistry) isPrimaryTopicOf Base_(chemistry).