Abstract
A method based on Schreinemakers’s tie-line theory of 1893 is derived for determining the composition and phase amounts in solubility experiments for multi-solvent electrolyte systems. The method uses the lever rule in reverse compared to Schreinemakers’s wet residue method, and is therefore called the reverse Schreinemakers (RS) method. The method is based on simple mass balance principles similar to the wet residues method. It allows for accurate determination of the mixed-solvent phase composition even though part of the solvent may precipitate as complexes between solvent and salt. Discrepancies from determining the composition of salt mixtures by pH titration are discussed, and the derived method significantly improves the obtained result from titration. Furthermore, the method reduces the required experimental work needed for analysis of phase composition. The method is applicable to multi-solvent systems and may be used for the determination of solid-phase compositions, similar to Schreinemakers’s original “rest” method. An example calculation is presented for the Na2CO3-NaHCO3-MEG-H2O system.
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Fosbøl, P.L., Thomsen, K. & Stenby, E.H. Reverse Schreinemakers Method for Experimental Analysis of Mixed-Solvent Electrolyte Systems. J Solution Chem 38, 1–14 (2009). https://doi.org/10.1007/s10953-008-9353-4
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DOI: https://doi.org/10.1007/s10953-008-9353-4