Results 261 to 270 of about 17,547,833 (304)

Hydroxamic Acids as Weak Base Indicators:  Protonation in Strong Acid Media

The Journal of Organic Chemistry, 2001
The protonation equilibria of N-phenylbenzohydroxamic, benzohydroxamic, salicylhydroxamic, and N-p-tolylcinnamohydroxamic acids have been studied at 25 degrees C in concentrated sulfuric, hydrochloric, and perchloric acid media; the UV-vis spectral measurements were analyzed using the Hammett equation and the Bunnett-Olsen and excess acidity methods ...
B. GARCIA, S. IBEAS, F. J. HOYUELOS, J. M. LEAL, SECCO, FERNANDO, VENTURINI, MARCELLA   +5 more
openaire   +3 more sources

Applicability of excess acidity functions in low‐acidity media

Journal of Physical Organic Chemistry, 1991
AbstractIt is demonstrated that excess acidity functions do not correspond well to the pH scale in dilute solutions. Acidity constants, pK, of seven moderately weak bases were determined; they were calculated by means of excess acidity functions, since the corresponding ionizations occur at acidity levels where the pH scale is partly used.
Begoña García, José M. Leal
openaire   +1 more source

Acidities of strong neutral Brønsted acids in different media

Journal of Physical Organic Chemistry, 2012
Acidities of different families of acids are examined in media of different physical and chemical nature: water, acetonitrile (AN), 1,2‐dichloroethane (DCE) and the gas phase, with special emphasis on strong acids. Included are OH (carboxylic acids, alcohols, and phenols), NH (sulfonamides, imides), and CH (phenylmalononitriles, etc.) acids as well as ...
Elin Raamat, Karl Kaupmees, Gea Ovsjannikov, Aleksander Trummal, Agnes Kütt, Jaan Saame, Ivar Koppel, Ivari Kaljurand, Lauri Lipping, Toomas Rodima, Viljar Pihl, Ilmar A. Koppel, Ivo Leito   +12 more
openaire   +1 more source

The acidity of superacidic media derived from fluorosulfuric acid and trifluoromethanesulfonic acid

Analytica Chimica Acta, 1984
Abstract The acidity level of superacidic media derived from fluorosulfuric acid and trifluoromethanesulfonic acid (TFMS) was determined by using the potentiometric indicators tetrachloroquinone and tetrafluoroquinone. A voltammetric and potentiometric study of these indicators was conducted to evaluate their pH indicator range, from the strongest ...
Bernard Carre, Jacques Devynck
openaire   +1 more source

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
openaire   +1 more source

INTERPRETATION OF REACTIONS IN ACID THIOSULFATE MEDIA

Journal of Bacteriology, 1955
W W, LEATHEN, S A, BRALEY
openaire   +2 more sources

Kinetics in Acid Media

Industrial & Engineering Chemistry, 1943
Charles W. Deane, John R. Huffman
openaire   +1 more source

Tuning electron correlations of RuO2 by co-doping of Mo and Ce for boosting electrocatalytic water oxidation in acidic media

Applied Catalysis B: Environmental, 2021
Jianmin Sun, Weiqi Li
exaly  

Behavior of human orosomucoid in acid media

Biochimica et Biophysica Acta (BBA) - Protein Structure, 1968
V, Karpenko, Z, Pavlícek, V, Kalous
openaire   +2 more sources

Electrocatalysts for the Oxygen Evolution Reaction in Acidic Media

Advanced Materials, 2023
Liang Chen
exaly