Complexing and Hydrothermal Ore Deposition by Harold C. Helgeson

By Harold C. Helgeson

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By Harold C. Helgeson

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14 if a few assumptions are made in conjunction with Franck's (48) data for log ^ H c i m the supercritical region. 75 at the critical point. 20. Hci a n ^ l°g^647,HCi a r e thus available for calculating a constant ACp HC1 over a wide temperature interval, reducing the uncertainty of the calculation introduced by the doubtful significance of the first decimals in Robinson's values. 44 COMPLEXING AND HYDROTHERMAL ORE DEPOSITION From graphic evaluation of the log K vs. 9 kcal/mole for Ai/° 298 HC1.

14) The log Ku s vs. r curve calculated from Eqn. 11 has also been plotted in Fig. 15 to illustrate the importance of including the heat capacity term in the log Ku s calculations. The constant heat capacity term introduces a maximum in the curve which shifts to higher temperatures for less negative standard heat capacities of dissociation. As might be expected, the K^ s and K^ s curves in Fig. 15 qualitatively resemble the log K vs. T curve for water. H S> the log K# s vs. 01), is probably the closest approximation to the true curve.

These two sets of values are based on alternate calculations of ACp H s using Eqn. 14 and different values of log AT298,H S- The two sets of values, denoted by the superscripts A and B9 bracket the uncertainty in log Kn s and allow evaluation of the effects of this uncertainty on the calculated solution equilibria. FIG. 15. Temperature variation of log #H 2 S; D = 9 = O = ▲= values calculated from Equation 11, assuming AC£r = 0. values of log K^2s calculated from Eqn. 14. values of log K^s calculated from Eqn.

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