Isolation of 2-bromobenzoic acid

OK, Let's isolate 2-bromobenzoic acid* from the solution which contains it.

• The basic aqueous solution contains the salt* of 2-bromobenzoic acid, sodium 2-bromobenzoate*.
  
  
• You want to change sodium benzoate (salt of an organic acid) to the water-insoluble benzoic acid (organic acid) by converting the salt to a protonated, non-ionic* form.

Which solution will you add?

Organic Web Chem University of Alberta