The acidity constant of formic acid has been re-determined by precise e.m.f. measurements on cells without liquid junctions containing formic acid-sodium formate buffer solutions. The pKa is 3.739±0.001 at 25°C. This result agrees exactly with Saxton and Darken's value obtained by conductivity measurements but not with Harned and Embree's value obtained from e.m.f. measurements.
J. E. Prue and A. J. Read, Trans. Faraday Soc., 1966, 62, 1271 DOI: 10.1039/TF9666201271
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