Results 241 to 250 of about 415,146 (302)

Acidity level in concentrated mineral acid mixtures. Iso-acidic media

Canadian Journal of Chemistry, 1987
Assuming the relationship between the R0(H) acidity function and the water activity in mineral acid concentrated solutions, iso-acidic solutions are prepared by mixing in all proportion two or three of the acids: H3PO4, HCl, HClO4, H2SO4, H2SiF6. These solutions are characterized by an equal R0(H) acidity level and different redox and complexing ...
C. Louis, A. Bebba, J. Bessiere
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Dissolution of Platinum in Acidic Media

ECS Meeting Abstracts, 2006
Abstract not Available.
Kenichiro Ota, Yuuki Koizumi, Shigenori Mitsushima, Nobuyuki Kamiya   +3 more
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Fluorogermanate(IV) equilibria in acid media

Polyhedron, 1990
Abstract The equilibria between Ge(OH) 4 , HF and H + ions in aqueous solution have been investigated, at 25°C in NaClO 4 as well as in LiClO 4 med The potentiometric data have been explained by the presence of GeF 4 , Ge(OH)F 4 − , GeF 6 2− , HGeF 6 − and a minor complex ...
Liberato Ciavatta, Mauro Iuliano, Raffaella Porto, Ermanno Vasca   +3 more
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Pyrrhotite dissolution in acidic media

Applied Geochemistry, 2014
Abstract Non-oxidative dissolution rates for hexagonal pyrrhotite (Fe1−xS) were measured for pH values ranging from 0 to 1.3 and temperatures ranging from 25 to 70 °C. These results showed that pyrrhotite dissolution rate increases with decreasing pH or increasing temperature.
Paul Chiriţă, J. Donald Rimstidt
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Pyrite dissolution in acidic media

Geochimica et Cosmochimica Acta, 2004
Oxidation of pyrite in aqueous solutions in contact with air (oxygen 20%) was studied at 25°C using short-term batch experiments. Fe2+ and SO42− were the only dissolved Fe and S species detected in these solutions. After a short period, R = [S]tot/[Fe]tot stabilized from 1.25 at pH = 1.5 to 1.6 at pH = 3. These R values were found to be consistent with
Descostes, M., Vitorge, P., Beaucaire, C.   +2 more
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T. C. in acidic media

Journal of Labelled Compounds, 1970
AbstractTritium labelling of aromatic compounds in a few acidic media and the intramolecular distributions of radioactivities in the tritiated compounds were investigated. Various kinds of aromatic compounds were treated with powerful acid complex, TH2PO4.BF3, or some other tritiated acids at room temperature.
Masayuki Hamada, Reiko Kiritani
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Epimerization of Benzylpenicilloic Acid in Alkaline Media

Journal of Pharmaceutical Sciences, 1984
5R,6R-Benzylpenicilloic acid was found to epimerize slowly in alkaline media to 5S,6R-benzylpenicilloic acid until equilibrium was established. Epimerization proceeded via the imine tautomer of penamaldic acid rather than the enamine form and was found to favor the 5S,6R-epimer at equilibrium.
I, Ghebre-Sellassie, S L, Hem, A M, Knevel   +2 more
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Anoxic dissolution of troilite in acidic media

Journal of Colloid and Interface Science, 2006
The anoxic dissolution of troilite (FeS) in acidic medium has been investigated at 50 degrees C using batch dissolution experiments. Two different progress variables were followed during solid dissolution, i.e., the amounts of dissolved iron (nFe) and formed hydrogen sulfide (n(H(2)S)). The experimental studies performed at hydrogen ion concentrations (
Chirita, P., Descostes, M.
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Investigations on Squaric Acid in Superacidic Media

Chemistry – A European Journal, 2018
AbstractThe syntheses of [OC(COX)3][MF6] and [(COX)4][MF6]2⋅2 HF were carried out in superacidic media XF/MF5 (M=As, Sb; X=H, D). The degree of protonation is highly dependent on the stoichiometric ratio of the Lewis acid with regard to squaric acid.
Manuel Schickinger, Denise Cibu, Florian Zischka, Karin Stierstorfer, Christoph Jessen, Andreas Kornath   +5 more
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