The partial molal volume of silicic acid in 0.725 m NaCl

Details The partial molal volume of silicic acid in 0.725 m NaCl The partial molal volume of silicic acid in 0.725 m NaCl

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40.1185d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 10, pp.1185-1189

Physics

3

Scientific paper

The partial molal volume ( ) of silicic acid in 0.725 m NaCl at 20°C has been calculated from (1) direct volume changes due to the dissolution of anhydrous sodium silicate and (2) some literature values for the partial molal volumes of NaOH and water. , unconnected for electrostriction effects, was found to be 53 ± 2 ml mole -1 . , corrected for volume changes due to solvent electrostriction by charged Si species, was estimated to be in the range 58-62 ml mole -1 ; this range is 7-11 ml mole -1 greater than the calculated from Willey's (Mar. Chem. 2, 239-250, 1974) solubility data obtained from the dissolution, in seawater, of amorphous silica subjected to hydrostatic pressure. Our does, however, agree within experimental error with the calculated from Jones and Pytkowicz's (Bull. Soc. Roy. Sci. Liege 42 , 118-120, 1973) data for the solubility of amorphous silica in seawater at high pressure and is nearly in agreement with Willey's (Ph.D. thesis, Dalhousie University, 1975) solubility data for amorphous silica in 0.6 m NaCl.

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