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ORGANIC ACID

ORGANIC ACID. Carboxylic acid. or. Alkanoic acid . Objectives. At the end of the lesson, pupils should be able to. name, write and draw first four members of the alkanoic acid group . describe the formation of ethanoic acid by oxidation of ethanol. describe ethanoic acid as an acid.

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ORGANIC ACID

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  1. ORGANIC ACID Carboxylic acid or Alkanoic acid

  2. Objectives At the end of the lesson, pupils should be able to • name, write and draw first four members of the alkanoic acid group • describe the formation of ethanoic acid by oxidation of ethanol • describe ethanoic acid as an acid • describe the reaction of ethanoic acid with ethanol

  3. STRUCTURAL FORMULA Carboxylic acid(alkanoic acid) NAME MOLECUAR FORMULA Lesson Sequence USES ESTER FORMATION FORMATION OF ETHANOIC ACID

  4. Carboxylic Acid Alkanoic acid General formula - CnH2n+1COOH Functional Group

  5. H O C H H H O C H H H H H H C H C C C H H H H H H H O H H O C C H O H H H H H O C C C C H H H H Alkane CnH2n+2 Alkanoic acid CnH2n+1COOH Methanoic acid methane Ethanoic acid ethane propane Propanoic acid

  6. H H H O H H C C C H H O C C C H H H H H H H H H C C H H butane Butanoic acid

  7. Chemical Properties Ethanoic acid are weak acids It has sour taste and soluble in water It is poor conductor of electricity

  8. Ethanoic Calcium acid oxide It reacts with a base to form salt and water Calcium + water + Ethanoate Ca(CH3COO) 2 2CH3COOH + + CaO H2O

  9. Ethanoic Copper acid carbonate It reacts with a carbonate to give carbon dioxide Cu(CH3COO) 2 2CH3COOH + + CuCO3 H2O CO2 + Copper + water + Ethanoate + Carbon dioxide

  10. Ethanoic acid It reacts with a reactive metal to give hydrogen CH3COONa 2CH3COOH + + Na H2 Sodium Sodium + hydrogen + Ethanoate

  11. Formation Oxidation of alcohol by the action of atmospheric oxidation O2 2C2H5OH CH3COOH Ethanoic acid Ethanol

  12. Formation Chemical oxidation O2 2C2H5OH CH3COOH K2Cr2O7 Ethanoic acid Ethanol Acidified Potassium dichromate –oxidation agent

  13. O H C C H O H H H C C H + O H H H H H H O H O C C C C H H H H H Ester formation Ethanoic acid reacts with ethanol to form eater and water + H2O Ethyl Ethanoate Ethanol Ethanoic acid water + +

  14. Characteristics of esters Ester are sweet smelling compounds which are responsible for many fragnces in flowers and fruits eg bananas, oranges

  15. USES 1. As preservatives eg vinegar 2. Manufacturing of esters 3. Making of others chemicals and drugs

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