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B. Organic Acids

B. Organic Acids. Second functional group. 1. Carboxyl Group. -the functional group is the carboxyl group. O || --C--OH. Notice how the C is double bonded to one oxygen. Since there is only one more bonding site, the carboxyl group is always found on the end of a chain.

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B. Organic Acids

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  1. B. Organic Acids Second functional group 1. Carboxyl Group -the functional group is the carboxyl group O || --C--OH Notice how the C is double bonded to one oxygen Since there is only one more bonding site, the carboxyl group is always found on the end of a chain H H H O | | | || H-C--C--C--C--OH | | | H H H - H H+ H+ H+ In solution, it is the H from the OH that is creates the H+ Always written as “COOH” at the end of the molecular formula H H H O | | | || H-C--C--C--C--OH | | | H H H C3 H7 COOH This is how you recognize an organic acid

  2. Practice - Write out the molecular formula for the following O H || | HO-C--C--H | H H H O | | || H-C--C--C--OH | | H H O || H--C--OH CH3COOH HCOOH C2H5COOH 2. Naming Organic Acids Take the longest alkane chain, remove the “e” and add “oic acid” O || H--C--OH Methanoic acid Commonly called Formic acid H O | || H-C--C--OH | H Commonly called Acetic acid Ethanoic acid

  3. Example - Name the following acids H H O | | || H-C--C--C--OH | | H H H H O | | || H-C--C--C--OH | | HCHH | H O H H Cl H || | | | | HO-C--C--C--C--C--H | | | | H H Cl H Propanoic acid Butanoic acid 4,4-dichloro Pentanoic acid

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