Conclusions
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1.
The relative concentrations of NO2 + ions have been calculated for low concentrations of nitric acid (0.1–0.3 M), using internal standards.
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2.
A procedure is proposed for the calculation of NO2 + ion concentrations in sulfuric acid-nitric acid-water systems with high concentrations of HNO3 in the system, and values have been calculated for the equilibrium concentrations of NO2 + in solutions containing up to 6.8 M nitric acid.
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3.
A single curve has been plotted for the ionization of nitric acid in aqueous sulfuric acid solutions; the correctness of the scheme that has been adopted for the ionization of nitric acid has been verified.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1524–1530, July, 1984.
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Librovich, N.B., Rassadin, B.V., Medvetskaya, I.M. et al. Raman spectra of nitric acid in aqueous sulfuric acid solutions. Russ Chem Bull 33, 1401–1405 (1984). https://doi.org/10.1007/BF00956514
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DOI: https://doi.org/10.1007/BF00956514