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Also known as an ethanoate, a compound in which the acid hydrogen atom in acetic acid is replaced either by a metal (forming a soluble acetate salt containing the ion (CH3COO-)) or by an organic radical (giving a covalent ester such as ethyl acetate CH3COOC2H5). Acetate esters are of great commercial importance, being used as solvents and for the manufacture of plastics and fibers. The various cellulose acetates are used in sheet form as a base for photographic films.

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