Liquid junction potential and single ion activity coefficient for pH standard buffer TAPSO from 5 to 55°C using Pitzer model and Bates-Guggenheim convention

CHED 1420

Sean R. LeNoue, slenoue@drury.edu, Cole E. Denton, cdenton@drury.edu, Daniel A. Kaufmann, dkaufmann@drury.edu, Whitney D. Bair, wbair@drury.edu, Lakshmi N. Roy, lroy@drury.edu, and Rabindra N. Roy, rroy@drury.edu. Walter H. Hoffman Department of Chemistry, Drury University, 900 N. Benton Ave., Springfield, MO 65802
Electromotive force measurements of hydrogen-silver chloride cells of the type: Pt; H2 (g, 1 atm) | TAPSO (m1) + NaTAPSOate (m2) + NaCl (m3) | AgCl, Ag

have been carried out in isotonic saline solution. Measurements were made from 5 to 55°C at 5° intervals. Corrections for liquid junction potentials using a cell with liquid junction are incorporated. The values of pH of TAPSO from 5 to 55°C have been calculated. The activity coefficients of the single ion, γ-Cl, were calculated using Bates-Guggenheim convention and the Pitzer model. The results will be discussed in terms of the applicability of pH for biomedical research.

 

Undergraduate Research Poster Session: Physical Chemistry
2:00 PM-4:00 PM, Monday, March 26, 2007 Hyatt Regency Chicago -- Riverside Center, Poster

Division of Chemical Education

The 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007