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pH standardization of 0.05 mol·kg-1 tetraoxalate buffer at temperatures from (5 to 45) °C with added KCl molality up to 1.0 mol·kg-1

Lookup NU author(s): Emeritus Professor Arthur Covington

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Abstract

The standard pH of 0.05 mol·kg-1 potassium tetraoxalate was determined using the calculation method recommended by IUPAC (Pure Appl. Chem. 2002, 74, 2169-2200) at various temperatures from new Harned cell data and literature data. New data were obtained for 0.05 mol·kg-1 potassium tetraoxalate solution containing up to 1 mol·kg-1 KCl at temperatures of (5, 15, 25, 35, and 45) °C. One step in the calculation method of IUPAC is a linear extrapolation of the experimental quantity p[a(H+)γ(Cl-)], where a refers to the activity and γ refers to the activity coefficient, to zero molality of KCl. The possibilities of using more concentrated KCl solutions in this determination with nonlinear extrapolations were also investigated. © 2007 American Chemical Society.

Publication metadata

Author(s): Juusola PM, Partanen JI, Vahteristo KP, Minkkinen PO, Covington AK

Publication type: Article

Publication status: Published

Journal: Journal of Chemical and Engineering Data

Year: 2007

Volume: 52

Issue: 3

Pages: 973-976

Print publication date: 01/05/2007

ISSN (print): 0021-9568

ISSN (electronic): 1520-5134

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/je6005532

DOI: 10.1021/je6005532

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