Solution models reciprocal ionic

One could use the Debye-Hiickel ionic-atmosphere model to study how ions of opposite charges attract each other, (a) Derive the radial distribution of cation ( +) and anion (nj concentration, respectively, around a central positive ion in a dilute aqueous solution of 1 1 electrolyte, (b) Plot these distributions and compare this model with Bjerrum s model ofion association. Comment on the applicability of this model in the study of ion association behavior, (c) Using the data in Table 3.2, compute the cation/anion concentrations at Debye-HUckel reciprocal lengths for NaCl concentrations of lO and 10 mol dm", respectively. Explain the applicability of the expressions derived. (Xu)... 

The definition of the limit for dilute solutions is obviously important for the proper use of available chemical data. Moreover, as this property is also of particular importance for the sol-gel process discussed later it deserves further analysis. In the Debye-Hiickel ionic-cloud model, the influence of dissolved ions on a particular central ion is evaluated by comparing the mean distance between ions to the dimension of the ion cloud surrounding it. The latter is evaluated by the so-called Debye (or Debye-Hiickel reciprocal) length (1/k), which may be approximatively written for aqueous solutions at 25°C as ... 

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