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Acids and Le Chatelier’s Principle

Acids and Le Chatelier’s Principle. The reaction is reversible and governed by Le Chatelier’s Principle Addition of acid, shift to left (COOH) Removal of acid by addition of base, shift right (COO-). Esters. Ethyl butanoate is the strawberry odor Esters are fruity!

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Acids and Le Chatelier’s Principle

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  1. Acids and Le Chatelier’s Principle The reaction is reversible and governed by Le Chatelier’s Principle Addition of acid, shift to left (COOH) Removal of acid by addition of base, shift right (COO-)

  2. Esters Ethyl butanoate is the strawberry odor Esters are fruity! See Table 16.6 on page 424 Making Esters (above reaction) is called esterification

  3. Section 16.6 Naming Esters Think of esters as a product of COOH The first part of the name is the alkyl or aromatic group contributed by the alcohol (R’) The 2nd word is the COOH name with the –ic removed and -ate added. Draw propyl pentanoate

  4. Propyl Pentanoate

  5. 16.8 Ester Preparation Esterification: Making Esters by reacting a carboxylic acid with an alcohol and an acid (H+) catalyst Try 36a on pa. 436

  6. Answer to 36a on p 436 Note: It is an equilibrium reaction, meaning that if too much water around (rainy day?), reaction will shift to left (Le Chatelier’s Principle) The above reaction is an example of an Ester Hydrolysis See Section 16.9

  7. Sec. 16.9 (cont.) Saponification When you cleave an ester using base to make a salt and an alcohol. When saponifying, you are making soap!! Viewing from Text-CD from Chpt 20 on how Soap Works Section 20.3-View Surfactant MoleculesTry 35a, p. 436

  8. Assignment p. 435, #s 27, 29, 30, 31, 33, 35, 39

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