Isopiestic determination of the osmotic and activity coefficients of dilute aqueous solutions of the series MeEt3NI to HepEt3NI at 298.15K

2006 ◽  
Vol 249 (1-2) ◽  
pp. 147-152 ◽  
Author(s):  
Luis H. Blanco ◽  
Eliseo Amado ◽  
José A. Avellaneda
Keyword(s):  
Aqueous Solutions ◽  
Activity Coefficients ◽  
Dilute Aqueous Solutions

Determination of activity coefficients of aqueous solutions of urea in the ultracentrifuge

1970 ◽  
Vol 23 (5) ◽  
pp. 915
Author(s):  
EF Woods
Keyword(s):  
Aqueous Solutions ◽  
Activity Coefficients ◽  
Similar Type ◽  
Point Of View ◽  
Published Data ◽  
Molecular Weights ◽  
Equilibrium Sedimentation ◽  
Aqueous Urea ◽  
Determination Of Activity

Apparent molecular weights of aqueous urea solutions have been determined by equilibrium sedimentation over the concentration range 1-9M. At the speeds used in the ultracentrifuge (39460 to 67770 r.p.m.) there was evidence of the effect of pressure on the sedimentation of urea. Apparent molecular weights of urea were therefore calculated at the solution-air meniscus where the solution is at l atm. The derived activity coefficients showed a similar type of oncentration dependence to published data for urea but there were significant quantitative differences. The significance of the results from the point of view of calculating theoretical distributions in the ultracentrifuge is discussed.

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