Aqueous Environmental Geochemistry by Donald Langmuir PDF

By Donald Langmuir

ISBN-10: 0023674121

ISBN-13: 9780023674129

Langmuir offers an intensive presentation of traditional chemical concentrations, structures and procedures to assist readers (1) comprehend controls at the chemical caliber of floor and subsurface waters, and (2) distinguish among the usual and the anthropogenic. not like such a lot authors, whose civil/sanitary engineering backgrounds advertise a extra aquatic chemistry standpoint, Langmuir?s geology/geochemistry adventure focuses assurance at the chemical interactions among water and geological fabrics. The e-book offers beneficial education in utilizing within the geochemical computing device code MINTEQA2 as an necessary problem-solving device.

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Example text

16 General trend of solubility products of magnesian calcites as a function of MgC0 3 mole fraction. Based on Busenberg and Plummer (1989). 11. 8 compute the fonowing. (a) The Gibbs free energy of the reaction (I1G~) and its Keq; express the free energy in kcal/mol and kllmo!. (b) The Mf~ of the reaction from the tabulated enthalpy data, also expressing the result in kcal/mol and kJ/mo!. (c) The I1G~ of the reaction from the tabulated enthalpy and entropy data. Compare your answer to I1G~ computed via the approach used in (a).

Consistent with this behavior, We can largely sweep the dissolved gases out of a water by boiling it. In other words, the dissolution of gases in water is exothermic. 9 kcallmol for 02(g) = 0iaq). 03 mg/L at 0, 25, and 35°C (Manahan 1991). c: ::: ~ L Aragonite 0 eo ,S2 -9 -4 Anhydrite (metastable) ~ ......... I __ ! 2. 5 Sec. 6 Effect of Changes in T and P on the Equilibrium Constant 27 Inspection of the van't Hoff equation shows that the effect of a temperature change on Keq is proportional to the magnitude of the enthalpy of the reaction.

For these reactions, Mi; is practically constant and independent ofT, and the van't Hoff equation accurately predicts the change in Keq values with T. For many of the other reactions, accurate prediction of Key with the van't Hoff equation is limited to within ± 10 to 20 degrees of the reference temperature of 25°C. Earlier, in our introduction to enthalpy concepts, we defined exothermic (negative Min and endothermic (positive Min reactions. Exothermic reactions give off heat. reverse reaction is favored by an increase in temperature (reactant concentrations increase at the expense of product concentrations), thus Key values for the reaction decrease as the temperature rises.

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Aqueous Environmental Geochemistry by Donald Langmuir


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