Measurements of the activity coefficient of NaCl in NaC1-NazS04 electrolytes have been made using the cell Na, HglNaf, C1-, S042-IAgC11Ag, and have been compared with literature values obtained using cation-sensitive glass electrodes. Harned's rule is shown to be obeyed for both components within experimental errors over the ionic strength range from 0 to 6 m.
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