pH For the physiological buffer standard AMPSO from 5 to 55°C in an isotonic saline solution

CHED 348

Cole E. Denton, cdenton@drury.edu, Sean R. LeNoue, slenoue@drury.edu, Kinjal Majumder, kmajumder@drury.edu, Joshua T. Wollen, jwollen@drury.edu, Kelsey V. Smith, ksmith14@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
The values of pH for an amino acid compound "AMPSO" have been determined at temperatures from 5 to 55°C using potentiometric technique of the cell type: Pt; H2 (g, 1 atm)│AMPSO (m1), NaAMPSOate (m2), NaCl (m3)│AgCl, Ag. Three equimolal buffer solutions have been studied: (i) 0.04m AMPSO + 0.04m NaAMPSOate + 0.12m NaCl, (ii) 0.06m AMPSO + 0.06m NaAMPSOate + 0.10m NaCl, and (iii) 0.08m AMPSO + 0.08m NaAMPSOate + 0.08m NaCl. The values of the single ion activity coefficients have been included to calculate pH. This buffer substance has been recommended for pH standard for biological research.
 

Undergraduate Research Poster Session: Analytical Chemistry
11:00 AM-1:00 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