The equilibrium constant for dissociation equilibrium. It has the same properties as a general equilibrium constant, and its value changes only with temperature. AB A + B The dissociation constant for and is independent of the concentrations of AB, A, or B. In gas phase dissociation, the degree of dissociation may vary depending on the total pressure, but the dissociation constant itself does not change. In electrolyte solutions, the activity a or activity coefficient y is used instead of the concentration c in the above formula, and is the correct dissociation constant. In the case of electrolyte solutions, it is also called the ionization constant. Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition |
解離平衡の平衡定数.一般の平衡定数と同じ性質をもち,その値は温度によってのみ変化する. AB A + B の解離では解離定数は, で表され,AB,A,あるいはBの濃度に無関係である.気相での解離において解離度が全圧によって変わる場合があるが,解離定数そのものは変化しない.電解質溶液での解離では,上式の濃度cのかわりに,活量aあるいは活量係数yを用いて, が正しい解離定数である.電解質溶液の場合は電離定数ともいう. 出典 森北出版「化学辞典(第2版)」化学辞典 第2版について 情報 |
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