5 6 physical properties
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5.6 Physical properties. Sharp odors (up to C 9 ) Sour taste (citric acid). 5.6 Physical properties (cont.). High b.p. These are the most polar compounds encountered so far. All dioic acids are solids. acetic acid. 5.6 Physical Properties of Carboxylic Acids. Fig. 5.7

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5.6 Physical properties

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5 6 physical properties

5.6 Physical properties

  • Sharp odors (up to C9)Sour taste (citric acid)


5 6 physical properties cont

5.6 Physical properties (cont.)

  • High b.p

  • These are the most polar compounds encountered so far.All dioic acids are solids.

acetic acid


5 6 physical properties of carboxylic acids

5.6 Physical Properties of Carboxylic Acids

  • Fig. 5.7

    The boiling points of mono-carboxylic acids are compared to those of other types of compounds.


Carboxylic acids esters and other acid derivatives cont d

Carboxylic Acids, Esters, and Other Acid Derivativescont’d

  • Fig. 5.9

    A given carboxylic acid molecule can form two hydrogen bonds to another carboxylic acid molecule, producing a “dimer.”


Carboxylic acids esters and other acid derivatives cont d1

Carboxylic Acids, Esters, and Other Acid Derivativescont’d

  • Fig. 5.8

    Unbranched mono and dicarboxylic acids at room temperature and pressure.


5 6 physical properties cont1

5.6 Physical properties (cont.)

  • Water soluble (completely up to C4)

acetic acidH2O


Carboxylic acids esters and other acid derivatives cont d2

Carboxylic Acids, Esters, and Other Acid Derivativescont’d

  • Fig. 5.10

    The solubility in water of saturated unbranched-chain carboxylic acids.


5 7 preparation

5.7 Preparation

  • Primary alcohol oxidation

  • Oxidation of aldehydes


5 8 acidity of carboxylic acids

5.8 Acidity of Carboxylic Acids


Ionization

Ionization

  • Ionization movie

  • Acid, base, conjugate acid, conjugate base

  • Ka and pKa

  • pH and pKa

  • Carboxylic acids are weak acids (Table 5.3)


Models of carboxylic acids

Models of carboxylic acids

  • acetic acid

  • acetate ion

  • propanoic acid

  • Propionate

  • oxalic acid

  • pyruvic acid

  • Salicylic acid


5 8 acidity of carboxylic acids1

5.8 Acidity of Carboxylic Acids

Table 5.3


If ph pk a then ha a

If pH=pKa then [HA]=[A-]

If pH<pKa then [HA]>[A-]

If pH>pKa then [HA]<[A-]


5 9 carboxylic acid salts

5.9 Carboxylic acid salts

  • Reactions with bases

  • “ate” ions (weak bases)

  • Solubility properties of acids and “ate” ions

  • Reactions of “ate” ions with acids

  • demo


5 9 carboxylic acid salts1

5.9 Carboxylic acid salts

Fig. 5.11 Propionates, salts of propanoic acid, extend the shelf life of bread.


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