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Table 2 Solubility data

From: Silicate solution, cation properties, and mass transfer by aqueous fluid in the Earth’s interior

SiO2–H2O
Temp (°C) Press (MPa) Density (g/cm3) fH2O (MPa) SiO2 solubility, mSiO2 (kg/mol)a
800 728 0.794 852 0.0304
775 956 0.876 1440 0.0273
700 696 0.831 668 0.0082
625 542 0.813 364 0.0022
550 391 0.789 178 0.0004
SiO2–NaOH–H2O
Temp (°C) Press (MPa) Density (g/cm3) fH2O (MPa) SiO2 solubility, mSiO2 (kg/mol)b
800 1135 0.911 1978 0.0238
775 1012 0.891 1642 0.0448
700 851 0.88 999 0.0288
550 583 0.871 328 0.0092
SiO2–CaO–H2O
Temp (°C) Press (MPa) Density (g/cm3) fH2O (MPa) SiO2 solubility, mSiO2 (kg/mol)b
575 396 0.775 198 4.86525E−08
625 468 0.779 291 1.43231E−07
675 498 0.764 362 1.38469E−05
725 709 0.824 723 9.61047E−05
775 953 0.875 1430 0.000369701
825 933 0.849 1444 0.000506355
  1. aCalculations using the formalism from Manning (1994)
  2. bSee text for calculations