Glycine intracts with one mole of Bezoyl chloride in the
presence of 10% (w/v) solution to yield hippuric acid with the
elimination of one mole of hydrochloric acid. The excess of 10%
NaOH solution serves two purposes, first; to remove unreacted
benzoyl chloride. The NaOH solution hydrolyses the excess of
benzoyl chloride present in reaction mixture, thereby resulting in
formation of sodium chloride and sodium benzoate, which being water
soluble remains in solution. Secondly the hydrochloric acid
eliminated reacts with NaOH to yield NaCl. Both sodium benzoate and
sodium chloride are water soluble, whereas the desired product
hippuric acid being insoluble may be separated easily.