Amorphous silica solubilities--II. Effect of aqueous salt solutions at 25°C

Details Amorphous silica solubilities--II. Effect of aqueous salt solutions at 25°C Amorphous silica solubilities--II. Effect of aqueous salt solutions at 25°C

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..915m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 7, pp.915-917

Physics

8

Scientific paper

The solubility of amorphous silica was measured at 25°C in ten separate sets of aqueous salt solutions--potassium chloride, potassium nitrate, sodium chloride, lithium chloride, lithium nitrate, magnesium chloride, calcium chloride, magnesium sulfate, sodium bicarbonate and sodium sulfate. The concentrations of the salts were varied from zero to saturation with both salt and amorphous silica. With increasing concentration of salt, the solubility of amorphous silica always decreased as expected from an average value of 0.00218 m in water. Nevertheless, the extent of decrease differed greatly from a 6% decrease in a solution saturated with NaHCO 3 to a 95.7% decrease in a solution saturated with CaCl 2 . A striking correlation was observed: In the 1-1 and 2-1 electrolyte salt solutions at a given molality the effect on the solubility of silica depended upon the cation in the order Mg 2+ , Ca 2+ > Li + > Na + > K + .

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