Results 211 to 220 of about 584,075 (253)

Assessing the importance of nitric acid and ammonia for particle growth in the polluted boundary layer.

Environ Sci Atmos
Marten R, Xiao M, Wang M, Kong W, He XC, Stolzenburg D, Pfeifer J, Marie G, Wang DS, Elser M, Baccarini A, Lee CP, Amorim A, Baalbaki R, Bell DM, Bertozzi B, Caudillo L, Dada L, Duplissy J, Finkenzeller H, Heinritzi M, Lampimäki M, Lehtipalo K, Manninen HE, Mentler B, Onnela A, Petäjä T, Philippov M, Rörup B, Scholz W, Shen J, Tham YJ, Tomé A, Wagner AC, Weber SK, Zauner-Wieczorek M, Curtius J, Kulmala M, Volkamer R, Worsnop DR, Dommen J, Flagan RC, Kirkby J, McPherson Donahue N, Lamkaddam H, Baltensperger U, El Haddad I.   +46 more
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Acidities of Nitrous and Nitric Acids

European Journal of Inorganic Chemistry, 2005
AbstractThe energies of nitrous and nitric acid and their anions were calculated at the MP2(FC)/6‐311++G(2d,2p) level. Their acidity was related to the acidity of hydroxylamine derivatives using isodesmic reactions. This procedure reveals that the molecules of HNO2 and HNO3 are strongly stabilized (by 119 or 206 kJ·mol–1, respectively) but their anions
Otto Exner, Stanislav Böhm
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ChemInform Abstract: Acidity of Nitrous and Nitric Acids. [PDF]

ChemInform, 1988
The origin of the acidity of nitrous and nitric acids was studied via an analysis of the results of ab initio calculations using the 6-311++G** basis set. The difference in energy between the Z and E conformers of nitrous acid could be reproduced when correction was made for electron correlation, and the gas-phase ionization energies of nitrous and ...
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Nitric acid dimers

Journal of Molecular Structure: THEOCHEM, 2005
Abstract Three local minima on the potential energy surface of the nitric acid dimer are located by computations using hybrid density functional theory and second-order Moller–Plesset perturbation theory with a number of basis sets. The global minimum is a cyclic C 2 h structure, with a binding energy of 8.4 kcal/mol, in which the monomers are ...
James R. Hart, Ajit J. Thakkar
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ChemInform Abstract: Acidities of Nitric and Nitrous Acids.

ChemInform, 1988
AbstractThe greater acidities of nitric acid and nitrous acid relative to each other and relative to common organic acids are due to the initial‐state charge distribution in the molecules and not to preferential resonance stabilization of negative charge in the anions.
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Nitric acid

2016
This chapter focuses on the evaluation of nitric acid production. Apart from presenting the different methods used over time, and the technical and historical reasons for using the various technologies, the complete analysis of current processes is presented based on mass and energy balances.
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Aspects of the surface and bulk nitration of cellulose in nitric acid, nitric acid/water, and nitric acid/dichloromethane mixes

Journal of Applied Polymer Science, 1990
AbstractElectron spectroscopy for chemical analysis (ESCA) has been employed to follow the surface nitration of cellulose papers in nitric acid–water and nitric acid–dichloromethane mixes with the aim of: elucidating the identity of the nitrating species in these mixes and from comparison of surface and bulk degree of substitution (DOS) further ...
H. S. Munro, R. D. Short
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Nitric acid in rain water

Journal of Chemical Education, 1973
This trace analysis experiment is based on the conversion of nitrate to nitrite using a cadmium amalgam reductor column.
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Humidity, Ice, and Nitric Acid

Science, 2004
R. S. Gao et al. report average relative humidity, with respect to ice, of over 130% in the vicinity of low-temperature cirrus clouds and contrails (Reports, “Evidence that nitric acid increases relative humidity in low-temperature cirrus clouds,” 23 Jan., p. [516][1]).
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