Partial Molar Heat Capacities at Chosen Temperatures in the Range (298.15 to 328.15) K and Partial Molar Volumes at 298.15 K of N-Acetyl-N′-methyl-l-α-amino Acid Amides in Aqueous Solution

2012 ◽  
Vol 57 (5) ◽  
pp. 1423-1432 ◽  
Author(s):  
Sylwia Belica ◽  
Katarzyna Łudzik ◽  
Bartłomiej Pałecz
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Partial Molar Volumes ◽  
Heat Capacities ◽  
Molar Volumes ◽  
Partial Molar Heat Capacities

Thermodynamic properties of aqueous diethanolamine (DEA), N,N-dimethylethanolamine (DMEA), and their chloride salts: apparent molar heat capacities and volumes at temperatures from 283.15 to 328.15 K

2000 ◽  
Vol 78 (1) ◽  
pp. 151-165 ◽  
Author(s):  
Christopher Collins ◽  
Joelle Tobin ◽  
Dmitri Shvedov ◽  
Rom Palepu ◽  
Peter R Tremaine
Keyword(s):  
Partial Molar Volumes ◽  
Heat Capacities ◽  
Apparent Molar Heat Capacities ◽  
Molar Volumes ◽  
Partial Molar Heat Capacities ◽  
Relaxation Effects ◽  
Chemical Relaxation ◽  
Young's Rule ◽  
Vibrating Tube Densimeter ◽  
Chloride Salts

Apparent molar heat capacities Cp,ϕ and apparent molar volumes Vϕ for aqueous diethanolamine (HOC2H4)2NH, diethanolammonium chloride (HOC2H4)2NH2Cl, N,N'-dimethylethanolamine (HOC2H4)(CH3)2N, and N,N'-dimethylethanolammonium chloride (HOC2H4)(CH3)2NHCl were determined from 283.15 to 328.15 K with a Picker flow microcalorimeter and vibrating tube densimeter. The experimental results have been analyzed in terms of Young's Rule with the Guggenheim form of the extended Debye-Hückel equation and appropriate corrections for chemical relaxation effects. These calculations lead to standard partial molar heat capacities and volumes for the neutral amines, (HOC2H4)2NH(aq) and (HOC2H4)(CH3)2N(aq), and the ions (HOC2H4)2NH2+(aq) and (HOC2H4)(CH3)2NH+(aq) over the experimental temperature range. Key words: standard partial molar volumes, standard partial molar heat capacities, diethanolamine, dimethyethanolamine, aqueous alkanolamine ionization.

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