Development of a universal pH scale using standard buffer solutions of PIPES and PIPESO from 5 to 55°C

CHED 223

Paul A. Bryant, pbryant@drury.edu, Cole E. Denton, cdenton@drury.edu, Shawn M. Hayden, shayden@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
Emf measurements of hydrogen-silver chloride cells without liquid junction of the type: Pt; H2(g, 1 atm) | PIPES (m1) + NaPIPESate (m2) + NaCl (m3) | AgCl, Ag have been carried out. Measurements were made from 5 to 55°C at 5° intervals. The values of pH for PIPES and PIPESO from 5 to 55°C have been calculated using the simpler Bates-Guggenheim convention and more sophisticated Pitzer equations. The results will be explained in terms of the establishment of a self-consistent and unified pH scale that is applicable to all cases.
 

Undergraduate Research Poster Session: Biochemistry
2:30 PM-4:30 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Poster

Division of Chemical Education

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006