Cohen, Mark D. and Flagan, Richard C. and Seinfeld, John H. (1987) Studies of concentrated electrolyte solutions using the electrodynamic balance. 2. Water activities for mixed-electrolyte solutions. Journal of Physical Chemistry, 91 (17). pp. 4575-4582. ISSN 0022-3654. doi:10.1021/j100301a030. https://resolver.caltech.edu/CaltechAUTHORS:20150805-103745250
Full text is not posted in this repository. Consult Related URLs below.
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20150805-103745250
Abstract
An electrodynamic balance has been used to measure the water activity as a function of solute concentration at 20 °C for three aqueous electrolyte mixtures: NaCI-KCI, NaCl-KBr, and NaCl-(NH_4)_2SO_4. The measurements were performed by levitating single, charged particles of these electrolyte mixtures within the balance and measuring the mass of the particles as a function of the surrounding relative humidity. The deliquescence behavior of the mixed-electrolyte particles was also observed. For the alkali halide mixtures, the low-concentration data were consistent with earlier investigations. Data were obtained at higher concentrations than previously reported. The amount of water in the NaC1-(NH_4)_2SO_4 particles after drying was unknown. This, together with the lack of previously reported water activity data for this mixture, complicated the analysis of these experiments. Three models of mixed-electrolyte solutions-the Zdanovskii-Stokes-Robinson, Reilly-Wood-Robinson, and Pitzer methods-agreed well with the experimental data for the NaCl-KCl and NaCl-KBr systems over the range of concentrations that the models could be applied. The mixing rules' predictions were consistent with the experimental observations for the NaCl-(NH_4)_2SO_4 system assuming a small amount of water was retained in the particles after drying.
| Item Type: | Article | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Related URLs: |
| |||||||||
| ORCID: |
| |||||||||
| Additional Information: | © 1987 American Chemical Society. (Received: December 5, 1986) This work was supported by the U.S. Environmental Protection Agency under Grant No. R-810857. | |||||||||
| Funders: |
| |||||||||
| Issue or Number: | 17 | |||||||||
| DOI: | 10.1021/j100301a030 | |||||||||
| Record Number: | CaltechAUTHORS:20150805-103745250 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150805-103745250 | |||||||||
| Official Citation: | Studies of concentrated electrolyte solutions using the electrodynamic balance. 2. Water activities for mixed-electrolyte solutions Mark D. Cohen, Richard C. Flagan, and John H. Seinfeld The Journal of Physical Chemistry 1987 91 (17), 4575-4582 DOI: 10.1021/j100301a030 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 59204 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Irina Meininger | |||||||||
| Deposited On: | 09 Sep 2015 19:30 | |||||||||
| Last Modified: | 10 Nov 2021 22:16 |
Repository Staff Only: item control page
