By Mikhail F. Stashchuk (auth.)
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Additional info for The Oxidation-Reduction Potential in Geology/Problema Okislitel’no-Vosstanovitel’nogo Potentsiala V Geologii/à poбjiema oкиcлиteльho- Bocctahobиteльhoгo à otehциaлa B Γeoлoгии
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G&-. ) =RT InKp We may thus draw the following conclusion: to determine the equilibrium constant it is necessary to subtract from the standard change in free energy of the final products the standard changes in free energy of the reacting substances. Since tabular values of the standard changes in free energy are given for a single mole, AGO must be taken according to the stoichiometric coefficients of the reacting substances and the reaction products. As is well known, for infinitely dilute solutions the 3ssumption of partial pressures is entirely applicable: the concentration of a certain ion in water may be correlated with the partial pressure.
More or less fundamental knowledge of the given problem may be obtained only from a course in thermodynamiCS. CHAPTER 3 STABILITY DIAGRAMS OF IRON MINERALS tion-reduction systems. 0291g PH. Stability Boundary of the Natural Environment Before going on to construction of diagrams, it is advisable that we consider the stability boundaries of the natural environment. In the present work we shall analyze the reactions that take place in an aqueous medium. As a first approximation, therefore, we may say that the limits of formation, existence, and stability of authigenic minerals will be determined by the stability boundaries of water.
1 gramion to the state of equilibrium ion content a Fe .. I~e" determined by the given electrostatic characteristics. The electrostatic characteristics may be defined by the potential of the given system. For this, we recall that the work of an electrical current is determined by the product of the potential difference and the amount of transferred electricity: A = E F, The potential difference is the difference of intens ive values. F = RT In a Fe • .. , of the state when ~e'" = Ore" = 1 gram -ion), E2 is the potential of the equilibrium system corresponding to the given electrostatic state, and F is the charge per valence unit in 1 gramion.