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Applied Geochemistry & Lab Ch.2 Thermodynamics of Solutions

JYU. Applied Geochemistry & Lab Ch.2 Thermodynamics of Solutions. 1. DEFINITIONS. Solution : A single homogeneous phase resulted from the dissolution of two or more compositionally different phases (end members) . End members : The (real or imaginary) component phases to form a solution

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Applied Geochemistry & Lab Ch.2 Thermodynamics of Solutions

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  1. JYU Applied Geochemistry & LabCh.2 Thermodynamics ofSolutions

  2. 1. DEFINITIONS • Solution: A single homogeneous phase resulted from the dissolution of two or more compositionally different phases (end members) . • End members: The (real or imaginary) component phases to form a solution • Exsolution: Separation (phenomenon) into two or more different phases from a solution

  3. 2. Generals • Composition of a solution phase where X =mole fractions C=chemical compositions of the end members

  4. Gibbs free energy of a solution • Gibbs free energy of mechanically mixed phases • Gibbs free energy of mixing (solution forming) • + • (Will be duscussed this in much more detail later)

  5. 3. Preliminary Knowledge • Do you know • Roult’s law, • Henry’s law, • Partial molal properties, • Fugacity, • Activity, • Gibbs-Duhem equation, and • Standard state (in thermodynamics)?

  6. 5. Chemical Potential • Definition: • Example: For a system having two phses A & B, • The Gibbs free energy of the system • For a closed system, • At an equilibrium state, • Thus,

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