Acetate
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An '''acetate''', or '''ethanoate''', is either a [[salt (chemistry)|salt]] or [[ester]] of [[acetic acid]].
In [[organic chemistry]], the abbreviation ''Ac'' refers to the [[acetyl]] group. The anion and the functional group may be written as '''<sup>−</sup>OAc''' and '''AcO<sup>−</sup>''', or '''OAc''' respectively. Examples include HOAc and NaOAc for [[acetic acid]] and [[sodium acetate]] for the former, and EtOAc for [[ethyl acetate]] for the latter. Ac is also the symbol for the [[chemical element]] [[actinium]], but confusion between actinium and the acetyl group is rare, since actinium has virtually no role in organic chemistry.
==Salt==
The '''acetate''' [[anion]], [CH<sub>3</sub>COO]<sup>−</sup>, is a [[carboxylate]] and is the [[conjugate acid|conjugate base]] of [[acetic acid]]. The acetate ion is formed by the deprotonation of acetic acid:
:CH<sub>3</sub>COOH {{unicode|⇌}} CH<sub>3</sub>COO<sup>−</sup> + H<sup>+</sup>
==Ester==
An '''acetate ester''' is an ester of acetic acid, with the general formula CH<sub>3</sub>COOR, where R is an [[substituent|organyl group]].
'''Acetate''' can also refer to [[cellulose acetate]], especially fibres or other derived products such as the [[acetate disc]] used in audio record production. Cellulose acetate can be found in many household products.
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Prior to the discovery and naming of [[actinium]], the abbreviation '''Ac''' (or '''AC''') was sometimes used in chemical formulas to indicate the acetate ion. For example, the formula for [[sodium acetate]] might be given as '''NaAc''', rather than the more modern '''NaCH<sub>3</sub>COO''' or '''NaC<sub>2</sub>H<sub>3</sub>O<sub>2</sub>'''.
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==Structures==
<gallery>
Image:Acetate-anion-3D-vdW.png|<center>[[space-filling model]] of the acetate anion</center>
Image:Acetate-anion-3D-balls.png|<center>[[ball-and-stick model]] of the acetate anion</center>
Image:Acetate-anion-2D.png|<center>[[structural formula]] of the acetate anion</center>
Image:Acetate-anion-resonance-hybrid-2D-skeletal.png|<center>[[resonance (chemistry)|resonance hybrid]] of the acetate anion</center>
Image:Acetate-resonance-2D-skeletal.png|<center>[[resonance (chemistry)|canonical forms]] of the acetate anion (or OXYANION)</center>
Image:Acetate-anion-canonical-form-2D-skeletal.png|<center>[[skeletal formula]] of the acetate anion</center>
Image:Acetate-ester-2D-skeletal.png|<center>general skeletal structure of an acetate ester</center>
Image:Acetyl-group-2D-skeletal.png|<center>skeletal structure of the acetyl group</center>
</gallery>
== See also ==
*[[Acetylation]]
*[[Cellulose acetate]]
*[[Sodium acetate]]
{{commonscat|acetates}}
[[Category:Acetates]]
[[Category:Carboxylate anions]]
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