Get Benzoic Acid And Naoh Background. This means that mixing benzoic acid in ether helps benzoic acid move through into the aqueous phase as sodium benzoate. A 25.0 ml sample of an aqueous solution of pure benzoic acid is titrated using standardized 0.150 m naoh.
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The pka of benzoic acid is 4.2; Benzoic acid, c7h6o2 (or c6h5cooh), is a colorless crystalline solid and the simplest aromatic carboxylic acid. The name derived from gum benzoin, which was for a long time the only source for benzoic acid.
The primary reason benzoic acid dissolves only slightly in cold water is that, even though the carboxylic acid group is polar, the bulk of the benzoic.
Memorize the strong acids and you'll know everything else is weak. But during the reaction, that precipitate dissolve in aqueous phase. Benzoic acid reacts with naoh (depending on the molarity), and becomes an extremely polar ion, which will dissolve in the water that is in the naoh solution. Benzoic is soluble in a solution of naoh because the base forms the sodium salt with the acid to form sodium benzoate.