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Calculation of the Activity Coefficients of Ions in Weak Electrolyte Solutions

묽은 전해질용액에서 이온의 활동도계수 계산

  • Lee, Man-Seung (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University) ;
  • Son, Seong Ho (Korea Institute of Industrial Technology, Research Institute of Advanced Manufacturing Technology)
  • 이만승 (포대학교 신소재공학과 희유금속연구소) ;
  • 손성호 (한국생산기술연구원 뿌리산업기술연구소)
  • Received : 2018.08.27
  • Accepted : 2018.09.21
  • Published : 2018.10.31
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Abstract

The equilibrium constant of a chemical reaction is related to the standard Gibbs free energy change. Since equilibrium constant is defined as the ratio of the activities of the chemical species, it is necessary to consider the non-ideal behavior of the solutes as ionic strength of the solution increases. In this paper, the derivation of Debye-$H{\ddot{u}}ckel$ limiting law and its modification by which the activity coefficient of an ion can be calculated was explained. Moreover, the method to obtain the activity coefficient of an ion from the experimentally determined mean activity coefficients of an electrolyte was explained.

화학반응의 평형상수는 표준자유에너지변화와 관련된다. 평형상수는 반응물과 생성물의 활동도의 비이며 수용액에서 이온강도의 증가로 인한 용질의 비이상성을 고려할 필요가 있다. 묽은 전해질용액에서 이온의 활동도계수를 구할 수 있는 식인 Debye-$H{\ddot{u}}ckel$ 식의 유도과정과 확장식을 설명하였다. 전해질의 평균활동도계수의 실험값로부터 이온의 활동도계수를 구하는 방법을 설명하였다.

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References

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