Other
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1651s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 38, Issue 11, pp.1651-1664
Other
4
Scientific paper
The solubility of quartz has been determined in borax buffer solutions having total boron concentrations of 0.10, 0.20, 0.40 and 0.60 mol kg -1 and over the temperature range 130-350°C at the saturated vapour pressure of the system. The first ionization constant of silicic acid was calculated from the solubility data and varied from - log K 1 = 8.88 (± 0.15) at 130°C to - log K 1 = 10.06 (± 0.20) at 350°C. The solubility of quartz in these solutions was due to the presence of the three species, H 4 SiO 4 , H 3 SiO 4 - and NaH 3 SiO 4 °. The equilibrium constant for the reaction, Na + + H 3 SiO 4 - = NaH 3 SiO 4 ° extended from log K as = 1.18-1.40 (± 0.20) over the temperature interval 135-301°C. The formation of NaH 3 SiO 4 ° ion pairs was concluded to contribute significantly to the solubility of quartz in alkaline hydrothermal solutions when pH > 8 and sodium concentration exceeds 0.10 mol kg -1 .
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