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<table border="0" cellspacing="5" cellpadding="0"><tbody><tr><td colspan="6"> <p> <strong>Gibbs free energies of low temperature iron and silica oxyhydroxides in the system Fe–Si–O–H at 25°C and 1 bar</strong> </p> </td> </tr><tr><td> </td> <td align="left">Sadiq and Lindsay, 1979 (<sup>ref. 39</sup>) kcal mole<sup>-1</sup><br></td> <td align="left">Ponamperuma <em>et al</em>., 1967 (<sup>ref 25</sup>) kcal mole <sup>-1</sup><br></td> <td align="left">Langmuir, 1969 (<sup>ref. 360</sup>) kcal mole<sup>-1</sup><br></td> <td align="left">Winters and Buckley, 1986 (<sup>ref. 43</sup>) kcal mole<sup>-1</sup><br></td> <td align="left">SUPCRT92, Johnson <em>et al</em>., 1991 (<sup>ref. 19</sup>) kcal mole <sup>-1</sup><br></td> </tr><tr><td colspan="6"> <hr></td> </tr><tr><td align="left">Fe<sup>3+ </sup>(aq)<br></td> <td align="left">-4.02<br></td> <td align="left">--<br></td> <td align="left">-4.02<br></td> <td align="left">--<br></td> <td align="left">-4.12<br></td> </tr><tr><td align="left">Fe<sup>2+ </sup>(aq)<br></td> <td align="left">-21.80<br></td> <td align="left">-20.3<br></td> <td align="left">-21.8<br></td> <td align="left">-18.85<br></td> <td align="left">-21.87<br></td> </tr><tr><td align="left">Fe(OH)<sub>2 </sub>(s)<br></td> <td align="left">-117.584<br></td> <td align="left">-115.6<br></td> <td align="left">-117.584<br></td> <td align="left">-116.3<br></td> <td> </td> </tr><tr><td align="left">Fe(OH)<sub>3 </sub>(s) soil amorphous ferric iron<br></td> <td align="left">-170.250<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">--<br></td> </tr><tr><td align="left">Fe(OH)<sub>3 </sub>(s) aged amorphous ferric iron<br></td> <td align="left">-170.163<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">--<br></td> </tr><tr><td align="left">Fe(OH)<sub>3 </sub>(s) 4 day old amorphous ferric iron<br></td> <td align="left">-169.250<br></td> <td align="left">--<br></td> <td align="left">-169.040<br></td> <td align="left">--<br></td> <td align="left">--<br></td> </tr><tr><td align="left">Fe(OH)<sub>3 </sub>(s) freshly precipitated amorphous ferric iron<br></td> <td align="left">Nature uncertain<br></td> <td align="left">-166.0<br></td> <td align="left">-167.460<br></td> <td align="left">-166.5<br></td> <td align="left">--<br></td> </tr><tr><td align="left">Fe<sub>3</sub>(OH)<sub>8 </sub>(s) freshly precipitated amorphous mixed-valence iron<br></td> <td align="left">-459.220<br></td> <td align="left">-451.2 (nature uncertain)<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">--<br></td> </tr><tr><td align="left">H<sub>2</sub>O<br></td> <td align="left">-56.687<br></td> <td align="left">-56.7<br></td> <td align="left">-56.688<br></td> <td align="left">-56.69<br></td> <td align="left">-56.688<br></td> </tr><tr><td align="left">OH<sup>-</sup><br></td> <td align="left">-37.594<br></td> <td align="left">--<br></td> <td align="left">-37.594<br></td> <td align="left">--<br></td> <td align="left">-37.595<br></td> </tr><tr><td align="left">SiO<sub>2 </sub>amorphous<br></td> <td align="left">-203.02<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">-202.89<br></td> <td align="left">-202.89 (SiO<sub>2</sub>- <em>n</em>H<sub>2</sub>0)<br></td> </tr><tr><td align="left">Ferrosilite<br></td> <td align="left">-257.6<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">-267.16<br></td> <td align="left">-267.16<br></td> </tr><tr><td align="left">Si(OH)<sub>4 </sub>(aq)<br></td> <td align="left">-312.66<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">--<br></td> <td align="left">-312.6 (SiO<sub>2 </sub>[aq)]<br></td> </tr><tr><td colspan="6"> <hr></td> </tr></tbody></table>
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