Protonation of carbonate in aqueous tetraalkylammonium salts at 25°C

Daniela Piazzese, Antonio Gianguzza, Francesco Crea, Silvio Sammartano, Concetta De Stefano

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54 Citations (Scopus)

Abstract

Protonation constants of carbonate were determined in tetramethylammonium chloride (Me4NClaq 0.1≤I/mol kg−1 ≤4) and tetraethylammonium iodide (Et4NIaq 0.1≤I/mol kg−1 ≤1) by potentiometric ([H+]-glass electrode) measurements. Dependence of protonation constants on ionic strength was taken into account by modified specific ion interaction theory (SIT) and by Pitzer models. Literature data on theprotonation of carbonate in NaClaq (0.1≤I/mol kg−1 ≤6) were also critically analysed. Both protonation constants of carbonate follow the trend Et4NI>Me4NCl > NaCl. An ion pair formation model designed to take into account the different protonation behaviours of carbonate in different supporting electrolytes was also evaluated.
Original languageEnglish
Pages (from-to)1102-1112
Number of pages11
JournalTalanta
Volume68
Publication statusPublished - 2006

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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