Summary
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1.
The shift in the ultraviolet absorption maximum of 2-nitropyrrole resulting from change in solvent from glacial acetic acid to dilute acetic acid is associated with hydration of the solute molecules; the heat of hydration has a value of from −1.5 to − 1.7 kcal/mole.
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2.
In the course of the investigation measurements were made on the heat of mixing of acetic acid and water at 21–22‡ for final concentrations of 25–35%. The heat of mixing is zero when the acetic acid content of the final mixture is 28%.
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Literature cited
S. S. Novikov, V. M. Belikov, Iu. P. Egorov, E. N. Safonova, and L. V. Semenov, Bull. Acad. Sci. USSR, Div. Chem. Sci. (in the press).
C. Sandonini, Atti della reale Accad, dei Lincei Roma [6], 4, 63 (1926).
V. M. Belikov and M. N. Brezhnev, Zavod. Lab. 24, 650 (1958).
Landolt-Börnstein, Phys.-Chem. Tabellen, Dritter, Erganzungswerk III, 2283, Berlin, 1936.
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Belikov, V.M., Mairanovskii, S.G., Safonova, E.N. et al. Heat of hydration of 2-nitropyrrole. Russ Chem Bull 7, 1434–1436 (1958). https://doi.org/10.1007/BF00914859
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DOI: https://doi.org/10.1007/BF00914859