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A Graphical Presentation of the Born-Haber Cycle for Estimating the Electrode Potentials of Metals

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Michael Laing

School of Pure and Applied Chemistry, University of Natal, Durban 4041, Republic of South Africa

J. Chem. Educ., 2003, 80 (9), p 1057

DOI: 10.1021/ed080p1057

Publication Date (Web): September 1, 2003

Abstract

The traditional Born–Haber cycle for estimating E° for Mn⁺/M is represented visually by plotting step-by-step the values of ΔH_at, IE_i, and ΔH_hyd for the metal. Metals with a positive value of E° have an enthalpy sum, ΔH_at + IE_i + ΔH_hyd, greater than n × 439 kJ; those metals whose E° is negative have the sum less than n × 439 kJ. The relative influence of each energy factor is easily seen, notably the small value of ΔH_at and the large values of IE_i and ΔH_hyd. The difference between the estimated value of E° and its true value is due to entropy effects being ignored. This graphical approach is appropriate for sophomore- and junior-level students.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Inorganic Chemistry

Keywords (Subject):

Electrochemistry

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

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- Addition of a Project-Based Component to a Conventional Expository Physical Chemistry Laboratory
  Georgios Tsaparlis and Marianna Gorezi
  Journal of Chemical Education2007 84 (4), 668
  The conventional expository style of laboratory instruction has been criticized for its "cookbook" nature and for placing little emphasis on thinking. Inquiry-based activities require the learners to generate their own procedures. A simpler variety is the ...
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