Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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The Measurements of the Activity Coefficients by E.M.F. Method and A Study of the Hydration

E. M. F.法에 依한 活性度係數의 測定과 Ion水和에 對한 考察

  • Sakong, Yell (Department of Chemistry, College of Liberal Arts and Science, Kyung Pook National University) ;
  • Hwang, Jung-Euy (Department of Chemistry, College of Liberal Arts and Science, Kyung Pook National University)
  • 사공열 (慶北大學校 文理科大學 化學科) ;
  • 황정의 (慶北大學校 文理科大學 化學科)
  • Published : 19621200
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Abstract

In this study we have measured the activity coefficients of NaCl in solution by E.M.F. method, depending upon MacInnes' equation at 25 dog. The cell (electrodes) is same as MacInnes' except the cock which was designed by ourselves as figure 1.Additionally, we have calculated the hydration number of NaCl from the activity coefficients using Robinson's equation and ionic hydration number according to our new formula $\frac{n_M{^+}+0.8}{n_A{^-}-0.1}=n_{MA}$, which was mentioned our former thesis.We also have calculated the hydration number of some salts from the ionic hydration number using upper formula and have got reasonable series match with other's value.As the results of our studying, we conclude it as follow;1) Liquid junction potential depend only on the bulk concentration of the both solution.2) The formula $\frac{n_M{^+}+0.8}{{n_A{^-}}-0.1}=n_{MA}$ is reasonable one in deducing to ionic hydration number.3) From upper relation, we can calculate the hydration number of unknown salts from it's ionic hydration numbers.

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References

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