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
The boiling points of mono-carboxylic acids are compared to those of other types of compounds.
A given carboxylic acid molecule can form two hydrogen bonds to another carboxylic acid molecule, producing a “dimer.”
Unbranched mono and dicarboxylic acids at room temperature and pressure.
The solubility in water of saturated unbranched-chain carboxylic acids.
5.8 Acidity of Carboxylic Acids
If pH=pKa then [HA]=[A-]
If pH<pKa then [HA]>[A-]
If pH>pKa then [HA]<[A-]
Fig. 5.11 Propionates, salts of propanoic acid, extend the shelf life of bread.