Chapter 7 Solutions of Electrolytes. 7.1 transference of ion 7.2 conductance of electrolyte solution 7.3 Application of conductance 7.4 Strong Electrolytes. New Words and Expressions. galvanic cell 原电池 electrolytic cell 电解池 Cathode 阴极
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Consider an electrolyte of formula AaBb, which ionizes as follows:
AaBb == aAz+ + bBz-
a-b type of electrolyte
The speed with which the ion moves under a unit potential gradient.
The SI unit of it is m2·V-1· S-1.
1. Hittorf Method
2. Moving Boundary Method
cell constantK cell =l/A (7.6) SI unit:m-1,
m = m - Ac1/2 (7.8)
(dilute solution of strong electrolytes)
AB === A+ + B-
Because of the limit concentration, so
(Salt) = (Solution) - (Water)
Ironic mean activity and ironic activity factor
离子平均活度（mean activity of ions）
离子平均活度系数（mean activity coefficient of ions
离子平均质量摩尔浓度（mean molality of ions）
Where ci is the molar concentration of the ions of type i, zi is the valence of the ions.
1. The decrease in the molar conductivity of a strong electrolyte was attributed to the mutual interference of the ions, which becomes more pronounced as the concentration increases.
2. Because of the strong attractive forces between ions of opposite sighs, the arrangement of ions in solution is not completely random.
This is known as the Debye-Huckel limiting law