Thermodynamics of the Second Dissociation of a Substituted Aminopropanesulfonic Acid (TAPSO) from 5 °C to 55 °C

Electromotive force (emf) measurements of the cell without a liquid junction of the type Pt|H2|TAPSO (m 1) + NaTAPSOate (m 2) + NaCl (m 3)|AgCl|Ag were made at intervals of 5 K from 5 °C to 55 °C, including 37 °C, with stoichiometric molalities m 1 = m 2 = m 3 ranging from 0.01 to 0.1 mol·kg-1. At 2...

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Bibliographic Details
Published in:	Journal of chemical and engineering data Vol. 42; no. 3; pp. 446 - 448
Main Authors:	Roy, Rabindra N, Roy, Lakshmi N, Jordan, Shawnie, Weaver, Jason, Dalsania, Henry, Kuhler, Kathleen, Hagerman, Heather, Standaert, Jimmy
Format:	Journal Article
Language:	English
Published:	Washington, DC American Chemical Society 12-05-1997
Subjects:	Chemistry Exact sciences and technology General and physical chemistry Solution properties Solutions Correlation Electrochemical method Theoretical study Dissociation constant Electromotive force Aqueous solution Experimental study Thermodynamic properties Buffer solution
Online Access:	Get full text
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Summary:	Electromotive force (emf) measurements of the cell without a liquid junction of the type Pt\|H2\|TAPSO (m 1) + NaTAPSOate (m 2) + NaCl (m 3)\|AgCl\|Ag were made at intervals of 5 K from 5 °C to 55 °C, including 37 °C, with stoichiometric molalities m 1 = m 2 = m 3 ranging from 0.01 to 0.1 mol·kg-1. At 25 °C, pK 2 is 7.635, and consequently buffer solutions of TAPSO and its salt (NaTAPSOate) are useful for pH control in the region pH 6 to 8. The second dissociation constant (pK 2) of TAPSO can be expressed by the equation 2254.0057/(T/K) − 4.9783 + 0.88672 ln(T/K), with a standard deviation of ±0.0008. The zwitterionic buffer TAPSO is represented as 3-[N-(tris(hydroxymethyl)methyl)amino]-2-hydroxypropanesulfonic acid, a derivative of the parent compound taurine.
Bibliography:	istex:77BB32183ED412BE5E3635B281282B9EA16ECBD2 ark:/67375/TPS-5XS9Q0PZ-R Abstract published in Advance ACS Abstracts, March 1, 1997.
ISSN:	0021-9568 1520-5134
DOI:	10.1021/je9603279