Amorphous silica solubilities--I. Behavior in aqueous sodium nitrate solutions; 25-300°C, 0-6 molal

Details Amorphous silica solubilities--I. Behavior in aqueous sodium nitrate solutions; 25-300°C, 0-6 molal Amorphous silica solubilities--I. Behavior in aqueous sodium nitrate solutions; 25-300°C, 0-6 molal

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..907m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 7, pp.907-913

Physics

6

Scientific paper

The solubility of amorphous silica was obtained in aqueous sodium nitrate solutions up to six molal and at temperatures from 25 to 300°C. It was expected that solubilities in aqueous sodium chloride solutions would be similar. At 25°C, the solubility of amorphous silica is lowered from that in water to 0.00086 m in 6.12 m sodium nitrate, or a decrease of 60%. At 300°C, the corresponding decrease is only 27% from a solubility of 0.0269 m in H 2 O. From the change in solubility with temperature at a given constant molality of sodium nitrate, the molal heat of solution over the range, 100 to 300°C, increases from + 2.93 kcal mol -1 in water to + 3.64 kcal mol -1 in 6m sodium nitrate. The value approaches a constant of +3.8 kcal mol -1 as sodium nitrate approaches saturation at 10.8 molal.

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