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Carboxylic <br />Acids<br />
Let’s Recall<br />
What areCarboxylic Acids?<br /><ul><li>Belong to a homologous series of organic compounds similar to alkanes, alkenes and ...
The hydrocarbon chains contain the functional group  -COOH (carbonyl group)</li></ul>Structural Formula                   ...
Naming the Carboxylic Acids<br /><ul><li>Methanoicacid
 Total of one carbon atom (meth-)
 C0H1COOH
Ethanoicacid
 Total of two carbons atoms (eth-)
C1H3COOH
Propanoicacid
 Total of three carbon atoms (propan-)
 C2H5COOH</li></ul>*Take note of the functional group’s location, highlighted by the dotted box<br />
Naming Carboxylic Acids<br />H     H<br />H    C     C    H<br />H     H<br />H     O   <br />H    C     C    O    H<br />...
Physical Properties ofEthanoic Acids<br /><ul><li>Similar to its alcohol:
Colourless liquid at room temperature & relatively low boiling point of 118oC
Completely miscible(able to dissolve) in water
Has a characteristic ‘sour-ish’ smell
Is a weak acidof pH 3</li></li></ul><li>Are carboxylic acids the same as the acids we have learnt about in the chapter on ...
Video of demonstration<br />
Chemical Properties of Carboxylic Acids<br /><ul><li>As carboxylic acid is weak, its reactions produce the same outcomes a...
But, the reactions are less vigorous</li></li></ul><li>Acid Properties<br />Weak acids(pH ≈ 3).<br /><ul><li>Most of the a...
Reaction with bases<br /><ul><li>to form a salt and water</li></ul>For example:<br />CH3COOH  +  NaOH	 CH3COONa  +  H2O<br...
Reaction with reactivemetals<br /><ul><li>to form a salt and hydrogen</li></ul>For example:<br />2CH3COOH  +  Mg	 	(CH3COO...
Reaction with carbonates<br /><ul><li>to form a salt, carbon dioxide and water</li></ul>For example:<br />2CH3COOH  +  Na2...
Ethanoic acid is the most important organic acid<br /><ul><li>It is used in vinegar as preservative and flavourings.</li><...
Other Important Organic Acids<br />
<ul><li>Making of drugs, dyes, paints, insecticides, plastics.
Making of esters.</li></ul>Uses of Organic Acids<br />
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Carboxylic acids

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Carboxylic acids

  1. 1. Carboxylic <br />Acids<br />
  2. 2. Let’s Recall<br />
  3. 3. What areCarboxylic Acids?<br /><ul><li>Belong to a homologous series of organic compounds similar to alkanes, alkenes and alcohols
  4. 4. The hydrocarbon chains contain the functional group -COOH (carbonyl group)</li></ul>Structural Formula Chemical Formula<br />CH3COOH <br />or<br />CH3CO2H <br />=<br />
  5. 5. Naming the Carboxylic Acids<br /><ul><li>Methanoicacid
  6. 6. Total of one carbon atom (meth-)
  7. 7. C0H1COOH
  8. 8. Ethanoicacid
  9. 9. Total of two carbons atoms (eth-)
  10. 10. C1H3COOH
  11. 11. Propanoicacid
  12. 12. Total of three carbon atoms (propan-)
  13. 13. C2H5COOH</li></ul>*Take note of the functional group’s location, highlighted by the dotted box<br />
  14. 14. Naming Carboxylic Acids<br />H H<br />H C C H<br />H H<br />H O <br />H C C O H<br />H<br /><ul><li>Replace the ‘e’ with ‘oic acid’ at the end of the name of the hydrocarbon </li></ul>Example:<br />ethan<br />oic acid<br />ethane<br />
  15. 15. Physical Properties ofEthanoic Acids<br /><ul><li>Similar to its alcohol:
  16. 16. Colourless liquid at room temperature & relatively low boiling point of 118oC
  17. 17. Completely miscible(able to dissolve) in water
  18. 18. Has a characteristic ‘sour-ish’ smell
  19. 19. Is a weak acidof pH 3</li></li></ul><li>Are carboxylic acids the same as the acids we have learnt about in the chapter on acids and bases?<br />Watch and observe!!<br />It’s time to predict and discuss!<br />
  20. 20. Video of demonstration<br />
  21. 21. Chemical Properties of Carboxylic Acids<br /><ul><li>As carboxylic acid is weak, its reactions produce the same outcomes as those learnt from the chapter of Acids, Bases and Salts
  22. 22. But, the reactions are less vigorous</li></li></ul><li>Acid Properties<br />Weak acids(pH ≈ 3).<br /><ul><li>Most of the acid molecules are unionised in water.</li></ul>For example: 1.0 mol/dm3 solution of ethanoic acid<br /> CH3COOH(aq) CH3COO(aq) + H+(aq)<br />
  23. 23. Reaction with bases<br /><ul><li>to form a salt and water</li></ul>For example:<br />CH3COOH + NaOH CH3COONa + H2O<br />Acid Properties<br />
  24. 24. Reaction with reactivemetals<br /><ul><li>to form a salt and hydrogen</li></ul>For example:<br />2CH3COOH + Mg (CH3COO)2Mg + H2<br />Acid Properties<br />
  25. 25. Reaction with carbonates<br /><ul><li>to form a salt, carbon dioxide and water</li></ul>For example:<br />2CH3COOH + Na2CO3 2CH3COONa + CO2 + H2O<br />Acid Properties<br />
  26. 26. Ethanoic acid is the most important organic acid<br /><ul><li>It is used in vinegar as preservative and flavourings.</li></ul>Uses of Carboxylic Acids<br />
  27. 27. Other Important Organic Acids<br />
  28. 28. <ul><li>Making of drugs, dyes, paints, insecticides, plastics.
  29. 29. Making of esters.</li></ul>Uses of Organic Acids<br />
  30. 30. Esters<br />
  31. 31. Carboxylic acids reacts with alcohols<br /><ul><li>to form esters
  32. 32. in the presence of a few drops of concentrated sulphuric acid as catalyst</li></ul>General equation:<br />acid + alcohol ester + water<br />Esterification<br />
  33. 33. Have the general formula RCOOR’<br />What are esters?<br />Functional group of ester<br />
  34. 34. How to name esters?<br />Alcohol + Carboxylic acid  Ester + Water<br />Alkanol + Alkanoic acid  Alkyl alkanoate + Water<br />R’OH + RCOOH  RCOOR’ + H2O<br />
  35. 35. +<br />+<br />
  36. 36. methanol + ethanoicacid methyl ethanoate+ water<br /> CH3OH+ CH3COOHCH3COOCH3+ H2O<br />Esterification<br /> + <br />+<br />
  37. 37. Esters<br />
  38. 38. Time to watch and predict again!<br />Are esters acidic, neutral or basic?<br />
  39. 39. Video of demonstration<br />
  40. 40. Esters are neutral compounds with a sweet smell<br />Colourless and insoluble in water<br />Properties of esters<br />
  41. 41. Fruity flavours for perfumes, sweets, drinks and cakes<br />Artificial pineapple flavour is an ester made from ethanol and butanoic acid, called ethyl butanoate.<br />Solvents for organic compounds, such as glues, varnishes and paints.<br />Uses of Esters<br />
  42. 42. Summary<br />
  43. 43. How it all ties up <br />

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