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Carboxylic Acids. These are organic acids. The most common one is ethanoic acid. The functional group is C OH O. Carboxylic Acids. Naming The prefix is the same as alkanes The suffix is –anoic acid. Hydrocarbons.

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carboxylic acids
Carboxylic Acids
  • These are organic acids.
  • The most common one is ethanoic acid.
  • The functional group is C OH

O

carboxylic acids1
Carboxylic Acids
  • Naming
  • The prefix is the same as alkanes
  • The suffix is –anoic acid
hydrocarbons
Hydrocarbons

H H

H C C C OH

H H O

  • There are 3 carbons –Prop
  • Contains COOH –anoic acid
  • Name isPropanoic acid
carboxylic acid
Carboxylic Acid
  • Carboxylic acids have acid properties.
  • They have a pH less than 7.
  • They are weak acids.
  • They react with metals to produce H2 and a salt.
  • They react with carbonates to produce CO2 , H2O, and a salt.
carboxylic acids2
Carboxylic Acids
  • When carboxylic acids react they produce a negative ion.
  • Called –anoate ion
  • Eg ethanoic acid produces ethanoate ion
  • CH3COOH → CH3COO-
carboxylic acids3
Carboxylic Acids
  • Ethanoic acid + magnesium

magnesium ethanoate + hydrogen

CH3COOH + Mg → (CH3COOH)2Mg + H2

carboxylic acids4
Carboxylic acids
  • Carboxylic acids dissolve in water because they are polar compounds.
  • The –OH group at the end of the molecule makes the molecule polar.
  • If the carbon chain is too long then the acid loses its polar properties.
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