The partial molal volume of silicic acid in 0.725 M NaCl at 1°C determined by the neutralization of Na2SiO3 |
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Authors: | JPeter Hershey Iver W Duedall |
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Institution: | Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149 USA;Department of Oceanography and Ocean Engineering, Florida Institute of Technology, Melbourne, Florida 32901 Australia |
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Abstract: | The partial molal volume of silicic acid () in 0.725 M NaCl at 1°C was calculated from the measured volume change (Δ) due to the neutralization of anhydrous sodium metasilicate with HCl and the and obtained from the literature. , determined under experimental conditions of pH = 2.2, compares favorably with calculated from the measured volume change due to the hydrolysis of the meta-silicate salt at pH = 11 and from the partial molal volume due to electrostriction () of water by charged Si species present in the solution at the high pH. This agreement lends support to a semiempirical model for calculating in developed by Millero (1969). in 0.725 M NaCl needed for this calculation was also determined in this work. The rate of polymerization of Si(OH)4 at 1°C was monitored to insure that the monomer Si(OH)4 was the main Si species present during the determination of by neutralization of the alkali silicate. determined in this study compares favorably with the value calculated from high pressure solubility measurements. |
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