No. It is a reasonably weak acid with a pH of around 5. It wouldn't do any harm unless it came in contact with a cut or your eyes... Added: Citric acid: (1,2,3-tricarboxy-propan-2-ol) 'tricarboxylic...
I suppose that it is more simple to determine this value experimentally, by titration of a citric acid solution with a potassium hydroxide solution.However, if the material is pure, the theoretical...