A Pt,H2—AgCl,Ag e.m.f. cell is described whereby accurate measurements may be obtained from additions of stock solutions. Measurements with HCl + H2SO4 mixtures are used to evaluate the dissociation constant of the HSO–4 ion at 25°C. A method of extrapolation is described which aims at reducing uncertainties due to the ion size parameter. Some previous measurements with e.m.f. cells are also re-examined.
C. E. Evans and C. B. Monk, Trans. Faraday Soc., 1971, 67, 2652 DOI: 10.1039/TF9716702652
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