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ERIC Number: EJ1012178
Record Type: Journal
Publication Date: 2013-Feb
Pages: 7
Abstractor: As Provided
Reference Count: 34
ISBN: N/A
ISSN: ISSN-0021-9584
The Titration in the Kjeldahl Method of Nitrogen Determination: Base or Acid as Titrant?
Michalowski, Tadeusz; Asuero, Agustin G.; Wybraniec, Slawomir
Journal of Chemical Education, v90 n2 p191-197 Feb 2013
The final step of the Kjeldahl method of nitrogen determination in biological and other samples faces a dilemma: which titrant, whether acid or base, should be used for the titration of ammonia? To solve this problem, a simple calculation procedure, illustrating the manner of ammonia determination in this method, enables one to resolve this dilemma with the use of theory based on acid-base titration curves. It refers, in particular, to the choice of a strong acid (HCl, H[subscript 2]SO[subscript 4]) solution as a titrant for titration of the solution with H[subscript 3]BO[subscript 3] applied in a receiver flask following the distillation (NH[subscript 3]) step. The paper presents a clear illustration of the statement that "a good theory is the best practical tool". (Contains 1 table and 5 figures.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A