CHM 2354 Lecture Notes - Lecture 10: Ionic Strength, Ion, Sodium Chloride
25 May 2015
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Document Summary
Ions of water do not act as independent particles. They can surround whatever they are dissolving creating a sort of shell and increasing the size. The o binds cations and the hs bind anions. Exchanges rapidly between ion and anion activities. Size and charge depend on the number of bound water molecules. Look at charge density a smaller molecule with the same charge as a larger one will have a higher charge density and so bind more water and so it behaves as a larger species in solution. Activity is related to the relative size of the hydrated species. Cations are surrounded by anions and anions are surrounded by cations. In this way the effective charge is decreased. This shields the ions and decreases the attraction between them. The net charge of the ionic atmosphere is less than the ions. The ions move constantly in/out of the ionic atmosphere.
