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In page Conjugate (acid-base theory):

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A second common application with an organic compound would be the production of a buffer with acetic acid. If acetic acid, a weak acid with the formula CH3COOH, was made into a buffer solution, it would need to be combined with its conjugate base CH3COO in the form of a salt. The resulting mixture is called an acetate buffer, consisting of aqueous CH3COOH and aqueous CH3COONa. Acetic acid, along with many other weak acids, serve as useful components of buffers in different lab settings, each useful within their own pH range.[citation needed]