Some problems, however, are experienced in the practice, because the behavior of the experimental system studied is far from the expected one on the basis of the theoretical model. The proposed method has proved very accurate when applied to synthetic titration curves and data. The method is strictly based on mole and charge balances, and no approximations are made in deriving the equations. A new potentiometric method for the determination of the end point in the Kjeldahl titrimetric finish is proposed based on the linearization of the titration curve of the ammonia‐boric acid system. A thorough study of the titration with hydrochloric acid of ammonia trapped in a solution of boric acid is made in an attempt to explain the fundamentals of a widely applied standard method. Kjeldahl method using concentrated boric acid is a common practice in many laboratories.
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