Abstract

Abstract The stability of the ion pair NaSO 4 was determined by measuring the change in sodium activity with medium composition at constant ionic strength, using a sodium-sensitive glass electrode. The stability constants of MgSO 4 and MgCl + were determined indirectly from measurements of the stability of MgF + in different media. All measurements were performed at 1 atm pressure, 25 ± 0.1 °C and 0.7 M formal ionic strength. The stability constants for NaSO 4 − , MgSO 4 , MgF + and MgCl + are 1.8 ± 0.1, 6.3 ± 0.1, 22.9 ± 0.1 and 0.34 ± 0.02 M −1 , respectively.

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