A unified pH scale for all solvents: part I – intention and reasoning (IUPAC Technical Report)

Author:

Radtke Valentin1ORCID,Stoica Daniela2ORCID,Leito Ivo3ORCID,Camões Filomena4ORCID,Krossing Ingo1ORCID,Anes Bárbara5ORCID,Roziková Matilda6,Deleebeeck Lisa7,Veltzé Sune8ORCID,Näykki Teemu9,Bastkowski Frank10,Heering Agnes10ORCID,Dániel Nagy11,Quendera Raquel12,Liv Lokman13,Uysal Emrah13,Lawrence Nathan14

Affiliation:

1. Universität Freiburg, IAAC , Albertstr. 21, 79104 Freiburg , Germany

2. Laboratoire de Métrologie et d’Essais , 1 Rue Gaston Boissier, 75015 , Paris , France

3. University of Tartu , 14a Ravila Street, 50411 Tartu , Estonia

4. FCiências.ID, Centro de Química Estrutural, Faculdade de Ciências da Universidade de Lisboa , Campo Grande, 1749-016 Lisboa , Portugal

5. FCiências.ID , Centro de Química Estrutural , Faculdade de Ciências da Universidadede Lisboa, Campo Grande , 1749-016 Lisboa , Portugal

6. Czech Metrology Institute , Okružní 31/772, 638 00 , Brno , Czech Republic

7. Danish Fundamental Metrology , Kogle Allé 5 2970 Hørsholm , Denmark

8. Danish National Metrology Institute , Hørsholm , Denmark

9. Suomen ympäristökeskus (SYKE) , Latokartanonkaari 11, 00790 Helsinki , Finland

10. Physikalisch-Technische Bundesanstalt , Bundesallee 100, 38116 Braunschweig , Germany

11. Metrological and Technical Supervisory Department of the Government Office of the Capital City Budapest (BFKH) , Németvölgyi út 37-39, 1124 Budapest , Hungary

12. Instituto Português da Qualidade , Rua António Gião, 2, 2829-513 Caparica , Portugal

13. Electrochemistry Laboratory, Chemistry Group, The Scientific and Technological Research Council of Turkey - National Metrology Institute (TUBITAK UME) , Gebze , Kocaeli , 41470 , Turkey

14. ANBSensors , Unit 4, Penn Farm Studios, Haslingfield , Cambridge , CB23 1JZ , UK

Abstract

Abstract The definition of pH, its measurement and standard buffers, is well developed in aqueous solutions. Its definition in solvents other than water has been elaborated for a couple of solvents and their mixtures with water. However, the definition of a universal pH scale spanning all solvents and phases, not to mention standard procedures of measurement, is still a largely uncharted territory. UnipHied is a European collaboration and has the goal of putting the theoretical concept of an earlier introduced (2010) unified pHabs scale on a metrologically well-founded basis into practice. The pHabs scale enables the comparability of acidity between different phases. This article draws the connection of the concepts of unified acidity and secondary pH measurement.

Publisher

Walter de Gruyter GmbH

Subject

General Chemical Engineering,General Chemistry

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