Ternary mutual diffusion coefficients of NaCl-SrCl/sub 2/-H/sub 2/O at 25/degrees/C. 2. Total concentrations of 2. 0 and 3. 0 mol/times/dm/sup /minus/3/
Mutual diffusion coefficients were measured for aqueous NaCl-SrCl/sub 2/ mixtures at 25/degrees/C by using free-diffusion Rayleigh interferometry. These mixtures were total molarities of 2.0 and 3.0 mol/times/dm/sup /minus/3/ with molarity fractions of 2/3, 1/2, and 1/3, the results complement the authors earlier data at 0.5 and 1.0 mol/times/dm/sup /minus/3/. At a constant molarity ratio, the NaCl main-term coefficient decreases regularly by 19-36% with increasing concentration, in contrast, the SrCl/sub 2/ main-term coefficient is relatively constant, with 18% or less variation with concentration. The SrCl/sub 2/ cross-term coefficient is 7-23% of its corresponding main-term coefficient, whereas the NaCl cross-term coefficient varies from 8% to 73% of its corresponding main-term coefficient. Clearly, coupled diffusion is very important for these systems. Various estimation procedures were considered, including variations using the Nernst-Hartley equations and estimates from the corresponding binary solutions. None of these methods, for which sufficient auxiliary data are available, gave reliable estimates of diffusion coefficients for mixtures. At a total molarity of 3.0 mol/times/dm/sup /minus/3/ and molarity fractions of 1/2 and 1/3 NaCl, experiments with the SrCl/sub 2/ ..delta..c approx. 0 are convectively unstable with regard to fingering at the center of the boundary. Density data were also measured for the above systems.
- Research Organization:
- Lawrence Livermore Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5994218
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 92:21
- Country of Publication:
- United States
- Language:
- English
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PHYSICAL AND ANALYTICAL CHEMISTRY
SODIUM CHLORIDES
DIFFUSION
STRONTIUM CHLORIDES
AQUEOUS SOLUTIONS
EXPERIMENTAL DATA
PREDICTION EQUATIONS
WATER
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
DATA
DISPERSIONS
EQUATIONS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
SOLUTIONS
STRONTIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties