Chemical potential and concentration fluctuation in some aqueous alkane-mono-ols at 25oC

• Published in: Canadian journal of chemistry Vol. 81; no. 2; pp. 141 - 149
• Main Authors: Hu, Jianhua, Haynes, Charles A, Wu, Amy HY, Cheung, Candy MW, Chen, Mark M, Yee, Eric GM, Ichioka, Takehiko, Nishikawa, Keiko, Westh, Peter, Koga, Yoshikata
• Format: Journal Article
• Language: English; Japanese
• Published: Ottawa, Canada NRC Research Press 01-02-2003
• ISSN: 0008-4042; 1480-3291
• DOI: 10.1139/v03-007

Vapour pressures of binary aqueous solutions of methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, and 1-hexanol were measured at 25.00
o
C in small compositional increments over the entire compositional range. Without resorting to any fitting function, the partial pressures were calculated numerically by methods based on the Gibbs–Duhem relation. When the system had an azeotrope, near which the numerical methods caused large errors, a graphical readjustment was applied such that the concentration fluctuation, S
XX
(0) = RT(1 – x
AL
)/(
µ
E
AL
/
x
AL
), connected smoothly across the azeotrope. Values of S
XX
(0) from scattering experiments were also used as a guide for the readjustment procedure. Hence, we report here chemical potential data free from any model or any fitting function.Key Words: aqueous mono-ols, partial pressures by the Boissonnas method, concentration fluctuations.