Caffeine as non-toxic corrosion inhibitor for copper in aqueous solutions of potassium nitrate

2006 ◽  
Vol 253 (2) ◽  
pp. 566-571 ◽  
Author(s):  
Thuanny Fallavena ◽  
Muriel Antonow ◽  
Reinaldo Simões Gonçalves
Keyword(s):  
Aqueous Solutions ◽  
Corrosion Inhibitor ◽  
Potassium Nitrate

scholarly journals Nicotine aqueous solutions: pH-measurements and salting-out effects - analysis of the effective Gibbs energies of hydration and ionic strengths of the solutions

2014 ◽  
Vol 79 (7) ◽  
pp. 829-842 ◽  
Author(s):  
Nikola Grozdanic ◽  
Marta Calado ◽  
Mirjana Kijevcanin ◽  
Slobodan Serbanovic ◽  
Zoran Visak
Keyword(s):  
Aqueous Solutions ◽  
Cloud Point ◽  
Sodium Sulfate ◽  
Potassium Nitrate ◽  
Inorganic Salts ◽  
Ph Measurements ◽  
Salting Out ◽  
Hydrogen Bond Interactions ◽  
Gibbs Energies ◽  
Cloud Points

This work is a continuation of our previous studies on the phase demixing - salting-out effects - in aqueous nicotine solutions. Thus, pH measurements were carried out allowing a brief analysis of the existing hydrogen bond interactions. Salting-out effects - the related experimental cloud point shifts - provoked by the addition of two inorganic salts, potassium nitrate and sodium sulfate, which were not studied so far, were determined. Analysis of the current and our previously reported salting-out/or salting-in phenomena in nicotine aqueous solutions was performed. In this respect, five studied salts were included: four inorganic salts (sodium chloride, potassium nitrate, sodium sulfate and sodium phosphate (Na3PO4)) and ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate ([C2mim][EtSO4] or ECOENG212?). Based on the pH measurements the effective Gibbs energies of hydration and ionic strengths of the respective ternary solutions were calculated and plotted against the related cloud-point shifts caused by the addition of the salts. For the studied salts, the results and diagram obtained within this work may be used to predict the cloud-points shifts, based on the related quantities of the salts added and/or the molar Gibbs energies of hydration and/or ionic strengths requested in each case.

Calcium(II) and Magnesium(II) Binding by L-Serine Orthophosphate in Aqueous Solutions

1971 ◽  
Vol 49 (13) ◽  
pp. 2359-2364 ◽  
Author(s):  
C. W. Childs
Keyword(s):  
Aqueous Solutions ◽  
Least Squares ◽  
Potentiometric Titration ◽  
Metal Ion ◽  
Dissociation Constants ◽  
Equilibrium Constants ◽  
Potassium Nitrate ◽  
Tetraethylammonium Bromide ◽  
Nitrate Medium ◽  
Complexation Reactions

The dissociation of L-serine orthophosphate (H3L) and its complexation reactions with calcium(II) and magnesium(II) have been studied by potentiometric titration at 37 °C in the 0.15 mol l−1 potassium nitrate medium and (with the exception of calcium(II) complexation) in the 0.15 mol l−1 tetraethylammonium bromide medium. A least squares interpretation of the data has yielded dissociation constants for H3L and equilibrium constants for the formation of the 1:1 metal–ion complexes MH2L+, MHL, and ML−. In addition the dimeric species H5L2−, MH3L2−, and M2H2L2 are consistent with the data and equilibrium constants for their formation have been determined.

Salting-Out of n-Propyl Alcohol with Potassium Nitrate from Aqueous Solutions

2005 ◽  
Vol 78 (3) ◽  
pp. 394-398
Author(s):  
S. I. Sinegubova ◽  
D. G. Cherkasov ◽  
K. K. Il’in
Keyword(s):  
Aqueous Solutions ◽  
Potassium Nitrate ◽  
Salting Out ◽  
Propyl Alcohol
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