Enthalpies of Dilution and Excess Molar Enthalpies of an Aqueous Solution of Sulfuric Acid

2001 ◽  
Vol 46 (1) ◽  
pp. 138-143 ◽  
Author(s):  
S. H. Kim ◽  
M. Roth
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Excess Molar Enthalpies ◽  
Enthalpies Of Dilution

Fundamental Measurements of the Friction on an Atomically-Flat Terrace of Au(100) in Sulfuric Acid Solution under Potential Control Using Electrochemical Atomic Force Microscope

2006 ◽  
Vol 512 ◽  
pp. 395-398
Author(s):  
Nobumitsu Hirai ◽  
Tatsuya Tooyama ◽  
Toshihiro Tanaka
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Silicon Nitride ◽  
Acid Solution ◽  
Atomic Force Microscope ◽  
Friction Force ◽  
Potential Range ◽  
Potential Control ◽  
Atomic Force ◽  
Atomically Flat

Potential dependence of the friction force between an atomically-flat terrace of Au(100) single crystal and a tip attached to a silicon nitride cantilever of electrochemical atomic force microscope (EC-AFM) have been investigated qualitatively in 0.05 M H2SO4 aqueous solution. It is found that the friction force gains when the potential increases in the potential range between −400 mV and 400 mV vs Hg/Hg2SO4 electrode.

scholarly journals EFFECT OF DIATOMEAOUS EARTH TREATMENT USING HYDROGEN CHLORIDE AND SULFURIC ACID ON KINETICS OF CADMIUM(II) ADSORPTION

2010 ◽  
Vol 2 (2) ◽  
pp. 107-112
Author(s):  
Nuryono Nuryono ◽  
Narsito Narsito
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Hydrogen Chloride ◽  
Rate Constant ◽  
Diatomaceous Earth ◽  
Adsorption Rate ◽  
Physical Interaction ◽  
First Order ◽  
Adsorption Rate Constant ◽  
Kinetics Of

In this research, treatment of diatomaceous earth, Sangiran, Central Java using hydrogen chloride (HCl) and sulfuric acid (H2SO4) on kinetics of Cd(II) adsorption in aqueous solution has been carried out. The work was conducted by mixing an amount of grounded diatomaceous earth (200 mesh in size) with HCl or H2SO4 solution in various concentrations for two hours at temperature range of 100 - 150oC. The mixture was then filtered and washed with water until the filtrate pH is approximately 7 and then the residue was dried for four hours at a temperature of 70oC. The product was used as an adsorbent to adsorb Cd(II) in aqueous solution with various concentrations. The Cd(II) adsorbed was determined by analyzing the rest of Cd(II) in the solution using atomic absorption spectrophotometry. The effect of treatment was evaluated from kinetic parameter of adsorption rate constant calculated based on the simple kinetic model. Results showed  that before equilibrium condition reached, adsorpstion of Cd(II) occurred through two steps, i.e. a step tends to follow a reaction of irreversible first order  (step I) followed by reaction of reversible first order (step II). Treatment with acids, either hydrogen chloride or sulfuric acid, decreased adsorption rate constant for the step I from 15.2/min to a range of 6.4 - 9.4/min.  However, increasing concentration of acid (in a range of concentration investigated) did not give significant and constant change of adsorption rate constant. For step II process,  adsorption involved physical interaction with the sufficient low adsorption energy (in a range of 311.3 - 1001 J/mol).     Keywords: adsorption, cdmium, diatomaceous earth, kinetics.

Rate of lactamization of benzylstrychnine in acid solution

1984 ◽  
Vol 62 (1) ◽  
pp. 144-146 ◽  
Author(s):  
John T. Edward ◽  
Sin Cheong Wong ◽  
Robert A. McClelland
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Acid Concentration ◽  
Amino Group ◽  
Cage Structure ◽  
Basic Formula

The rate of lactamization of benzylstrychnine in aqueous solution at 25 °C increases with acid concentration up to 5–10% sulfuric acid, and thereafter decreases. The maximum can be explained by taking account of the extent of protonation of the aromatic amino group with increasing acid concentration. This amino group is unusually weakly basic [Formula: see text], perhaps because it is locked in an extremely rigid cage structure which opposes the rehybridization of N which must take place when it is protonated.

Enthalpies of dilution of tris-ethylenediaminocobalt(III) chloride in aqueous solution at 25�C

1996 ◽  
Vol 25 (2) ◽  
pp. 167-177 ◽  
Author(s):  
Jes�s M. Arsuaga ◽  
Fernando Fern�ndez-Mart�n ◽  
Javier N��ez
Keyword(s):  
Aqueous Solution ◽  
Enthalpies Of Dilution

Rate of corrosion of titanium-nickel alloys in a 50% aqueous solution of sulfuric acid at 20�c

1973 ◽  
Vol 7 (8) ◽  
pp. 508-511
Author(s):  
N. M. Shmakov ◽  
V. S. Mikheev ◽  
L. I. Lishcheta ◽  
R. F. Sabynina ◽  
E. G. Turyanskaya
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Nickel Alloys ◽  
Titanium Nickel
Sign in / Sign up

Export Citation Format

Share Document