Sur quelques réactions acide–base dans les solvants fortement basiques anhydres. III. n-Butylamine

1971 ◽  
Vol 49 (11) ◽  
pp. 1895-1900 ◽  
Author(s):  
W. R. Heumann ◽  
L. Šafařík
Keyword(s):  
Hydrochloric Acid ◽  
Alkali Metal ◽  
Electrode Potential ◽  
Weak Acids ◽  
Pure Nitrogen ◽  
Potentiometric Measurements ◽  
Higher Temperature ◽  
Orange Color ◽  
Reddish Orange

Cesium is the only alkali metal to react with n-butylamine, even at higher temperature. The n-butylamides of Na and K were prepared by heating the amine with the respective alkali hydrides. The amides were obtained as crystalline greyish white powders, which are stable when kept under pure nitrogen. The neutralization of a series of monobasic acids of various strength in n-butylamine by these amides was studied potentiometrically using a platinum indicating electrode. Potential jumps ranging from 1550 mV for hydrochloric acid to about 110 mV for diphenylmethane were obtained. The latter compound was the least acidic [Formula: see text] to react with the bases, while toluene [Formula: see text] did not react. The [Formula: see text] value of n-butylamine should therefore be about 37 to 38. Several dibasic acids and mixtures of two acids were also neutralized. The power of differentiation of the n-butylamine/butylamide system is quite pronounced, but in many cases potentiometric measurements were difficult due to precipitation of the salts formed. The neutralization of triphenylmethane produces an intense reddish orange color, which could be used as an indicator in visual titrations of weak acids with the n-butylamides.

CCXLVI.—The effect of hydrochloric acid on the electrode potential between mercury and mercurous chloride

1927 ◽  
Vol 0 (0) ◽  
pp. 1906-1911
Author(s):  
Sydney Raymond Carter ◽  
Frederick Measham Lea ◽  
Robert Anthony Robinson
Keyword(s):  
Hydrochloric Acid ◽  
Electrode Potential ◽  
Mercurous Chloride

scholarly journals Removal of Heavy Metal Ion Using Polymer-Functionalized Activated Carbon: Aspects of Environmental Economic and Chemistry Education

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Hoang Thu Ha ◽  
Nguyen Thi Huong ◽  
Le Linh Dan ◽  
Nguyen Duy Tung ◽  
Vinh Bao Trung ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Metal Ion ◽  
Chemistry Education ◽  
Atomic Radius ◽  
Toxic Heavy Metals ◽  
Pure Nitrogen ◽  
Amine Functionalized ◽  
Higher Temperature ◽  
Lower Temperature

Numerous countries have shown signs of environmental pollution to prioritize economic growth and benefits, leading to seriously contaminated waters. This work indicated the method to synthesize a green material, which could remove contaminants to protect the natural environment. The porosity and functionality effects of amine-functionalized activated carbon (AFAC) enhanced the removal of toxic heavy metals (THMs) in aqueous solution. The raw activated carbon (RAC) was thermally modified with ultrahigh pure nitrogen (UHPN) at 500°C and 1000°C and then amine-functionalized with coupling agent of aminopropyltriethoxysilane (APS). They were denoted as AFAC-5 and AFAC-10, respectively. The data showed an enhanced metal adsorption capacity of the AFACs, because the modification produced more desired porosity and increased amine functional groups. AFAC-10, modified at a higher temperature, showed much higher THM adsorption capacity than AFAC-5, modified at a lower temperature, and RAC. The adsorption capacity decreased in the following order: Ni > Cd > Zn, which was in good agreement with the increasing electronegativity and ionic potential and the decreasing atomic radius. The maximum THM adsorption capacity of AFAC-10 for Ni, Cd, and Zn was 242.5, 226.9, and 204.3 mg/g, respectively.

A Study on Catalytic Hydrolysis of Corncob by Formic Acid

2012 ◽  
Vol 560-561 ◽  
pp. 321-324
Author(s):  
Jing Wen Xue ◽  
Zhe Wang
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Formic Acid ◽  
Degradation Products ◽  
Chemical Compositions ◽  
Catalytic Hydrolysis ◽  
Higher Temperature ◽  
Hydrolysis Residue ◽  
Hydrolysis Of

Corncob powder was hydrolyzed with formic acid under the catalyzation of hydrochloric acid. Sugar contents in hydrolysis liquor at different reaction time and temperature were determined. The chemical compositions in hydrolysis residue were also analyzed. Results showed that the formic acid could hydrolyze the polysaccharides in corncob and the degradation products were dissolved in hydrolysis liquor. The addition of catalytic hydrochloric acid accelerated the hydrolysis of polyose. The proper hydrolysis condition was 80°C for 3h. Lignin might undergo hydrolysis at higher temperature.

An electron spin resonance study of pure anthracene doped with alkali metals

1970 ◽  
Vol 23 (2) ◽  
pp. 261 ◽  
Author(s):  
VC Bien ◽  
LE Lyons
Keyword(s):  
Electron Spin Resonance ◽  
Alkali Metal ◽  
Exchange Interaction ◽  
Line Width ◽  
Electron Spin ◽  
Alkali Metals ◽  
Spin Lattice Relaxation ◽  
Electron Spin Resonance Study ◽  
Pure Nitrogen ◽  
Spin Resonance

When pure anthracene is melted under a pure nitrogen atmosphere in the presence of an alkali metal, the metal dissolves forming a blue-green melt which exhibits an electron spin resonance (e.s.r.) signal. The polycrystalline samples of the solid system (MAn) obtained by cooling the melt also exhibit e.s.r, signals but with a line-width greater than that seen in the melt. The Lorentzian line-shapes in the solid and the melt indicate that the electrons producing the signals are either delocalized, or clustered and undergoing exchange interaction. The following features are discussed: the lack of hyperfine structure in the melt except for a special case; the Curie dependence of the susceptibility; the dependence of the g-values on the alkali metal; the shifts of the g-values on melting the samples; the behaviour of the line-width with respect to deuteration of anthraoene and with respect to the different alkali metals; and the dependence of the spin-lattice relaxation time on the alkali metal and on whether the sample was solid or molten. The features indicate that the electrons behave as simple doublets, are clustered with the alkali-metal complex in the solid and undergo exchange interaction, produce motional narrowing of lines in the melt, and produce a line-width mainly dependent on the alkali metal ions in the solid and to a lesser extent in the melt.

Novel reddish-orange color emitting Ca2SiO4:Sm3+ phosphors for white LED applications prepared by using agricultural waste

2020 ◽  
Vol 221 ◽  
pp. 116996 ◽  
Author(s):  
L. Lakshmi Devi ◽  
C.K. Jayasankar
Keyword(s):  
Agricultural Waste ◽  
White Led ◽  
Orange Color ◽  
Reddish Orange

THE BACTERIAL DISSIMILATION OF NAPHTHALENE

1955 ◽  
Vol 1 (7) ◽  
pp. 579-588 ◽  
Author(s):  
J. F. Murphy ◽  
R. W. Stone
Keyword(s):  
Salicylic Acid ◽  
Phthalic Acid ◽  
Culture Medium ◽  
Basal Medium ◽  
Hydroxycinnamic Acid ◽  
Cell Free Extract ◽  
Major Pathway ◽  
Orange Color ◽  
Naphthalene Oxidation ◽  
Reddish Orange

Data are presented indicating that the major pathway for the oxidation of naphthalene by a strain of Pseudomonas occurs via salicylic acid, which is further oxidized through catechol to β-ketoadipic acid. On the basis of growth, simultaneous adaptation, and cell-free extract experiments, the following compounds are regarded as unlikely intermediates in naphthalene dissimilation: 1,4-naphthoquinone, α-naphthol, β-naphthol, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,5-dihydroxynaphthaIene, phenol, trans-o-hydroxycinnamic acid, and phthalic acid. Evidence was found that a second pathway of naphthalene oxidation produces 1,2-naphthoquinone. 1,2-Dihydroxynaphthalene was found to be non-enzymatically converted to 1,2-naphthoquinone. The 1,2-naphthoquinone was not further metabolized and was found to be responsible for the characteristic brown to reddish orange color of the culture medium. Omission of FeCl2and MgSO4from the basal medium prevented the formation of salicylic acid but did not interfere with the production of 1,2-naphthoquinone.

Dissolution Process of Palladium in Hydrochloric Acid: A Route via Alkali Metal Palladates

2015 ◽  
Vol 46 (6) ◽  
pp. 2476-2483 ◽  
Author(s):  
Ryo Kasuya ◽  
Takeshi Miki ◽  
Hisashi Morikawa ◽  
Yutaka Tai
Keyword(s):  
Hydrochloric Acid ◽  
Alkali Metal ◽  
Dissolution Process

The cerium(IV)/cerium(III) electrode potential in hydrochloric acid solution

1993 ◽  
Vol 32 (24) ◽  
pp. 5626-5628 ◽  
Author(s):  
Andrew W. Maverick ◽  
Qin Yao
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Hydrochloric Acid Solution ◽  
Electrode Potential

Didymodon californicus (Pottiaceae), a new species from California, U.S.A. 

Phytotaxa ◽  
2014 ◽  
Vol 158 (1) ◽  
pp. 105 ◽  
Author(s):  
Juan Antonio Jiménez ◽  
David Toren ◽  
James R. Shevock
Keyword(s):  
New Species ◽  
Cross Section ◽  
Light Microscope ◽  
Ventral Surface ◽  
New Taxon ◽  
Large Size ◽  
Orange Color ◽  
A New Species ◽  
Reddish Orange

Didymodon californicus is described as a new species from California, U.S.A. The new taxon is included in sect. Vineales (Steere) R.H. Zander, and characterized mainly by its large size, lanceolate leaves, plane margins throughout, the red to reddish orange color in KOH, costa ending below the apex, a hyaline area of rectangular cells on ventral surface of the costa, cross-section of the costa with numerous guide cells in 2–3 layers and without ventral stereids, and smooth to low-papillose laminal cells. Drawings and light microscope photographs of the main characters are given, and possible confusion with other closely related taxa is discussed.

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