Introducing the primary pH-metric standardization in nonaqueous solvents of extremely high permittivities: behaviour of the potassium hydrogen phthalate buffer in formamide, and acquisition of an appropriate salt bridge for pH measurements

被引：6

作者：

Falciola, L ^{[1
]}

Mussini, PR ^{[1
]}

Mussini, T ^{[1
]}

Pelle, P ^{[1
]}

机构：

[1] Univ Milan, Dept Phys Chem & Electrochem, I-20133 Milan, Italy

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2002年 / 4卷 / 02期

关键词：

primary pH standards; superpermittive solvents; formamide; primary medium effects; salt bridges;

D O I：

10.1016/S1388-2481(01)00293-4

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The primary pH-metric standardization, in compliance with the IUPAC guidelines is, for the first time. introduced in the domain of nonaqueous media of extremely high permittivities. In this context the primary standard pH(ps) values for the potassium hydrogen phthalate buffer in formamide have been determined over a range of temperatures, based on the potential difference measurements of Harned's cell. The found pH(ps) values decrease slightly with increasing temperature in the range 283-323 K according to: pH(ps) = 7.9538 - 0.008093 x (T (K)) + 0.0000100 x (T-2 (K)). Furthermore, to make the operational cell for pH measurements applicable to the present medium, a suitable equitransferent salt bridge (NH4Cl in formamide) has been characterized by the method of the concentration cell with transference. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：146 / 150

页数：5