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Chapter 7 Solutions of Electrolytes

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Chapter 7. Solutions of Electrolytes. Electrochemistry is ... Q:quanity of electricity (in unit of coulomb, C) t: time, sec. I: current (unit:amere, A) ... – PowerPoint PPT presentation

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Title: Chapter 7 Solutions of Electrolytes


1
Chapter 7 Solutions of Electrolytes
  • Electrochemistry is concerned with the properties
    of solutions of electrolytes and with processes
    that occur at electrodes.
  • anion(s)????anode ??
  • cation(s)????cathode??

2
  • Faradays Laws of Electrolysis
  • Q It
  • Qquanity of electricity (in unit of coulomb, C)
  • t time, sec
  • I current (unitamere, A)
  • The mass of an element produced at an electrode
    is proportional to the quantity of electricity Q.

3
  • Weak ElectrolytesThe Arrhenius Theory
  • An electrolyte in solution need not
    necessarily be completely dissociated into ions
    it may be only partially dissociated to yield
    ions in equilibrium with unionized molecules of
    the substance.
  • Strong Electrolytes Debye-Huckle Theory
  • Because of electrostatic attractions between
    charged ions ,each negative ion in solution must
    be surrounded on an average with more positive
    then negative ions.
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