# 規則溶液

${\displaystyle \Delta S_{m}=-nR(X_{A}\ln X_{A}+X_{B}\ln X_{B})\,}$

## 特點

${\displaystyle \Delta G_{m}=G^{xs}+\Delta G^{id}}$

${\displaystyle G^{xs}=H^{xs}=\Omega X_{A}X_{B}}$

${\displaystyle \Delta G_{m}=\Omega X_{A}X_{B}+RT(X_{A}\ln X_{A}+X_{B}\ln X_{B})}$
${\displaystyle \Omega =N_{0}Z{\mathcal {E}}}$${\displaystyle \Omega }$是一個與溫度無關之常數。

${\displaystyle \Omega =\alpha RT}$

${\displaystyle \Delta {\bar {G}}_{i}=RT\ln a_{i}=RT\ln(\gamma _{i}X_{i})}$

${\displaystyle \Delta {\bar {H}}_{A}=\Omega X_{B}^{2}=RT\ln \gamma _{A}}$
${\displaystyle \Delta {\bar {H}}_{B}=\Omega X_{A}^{2}=RT\ln \gamma _{B}}$

${\displaystyle \ln \gamma _{A}=\alpha X_{B}^{2}}$
${\displaystyle \ln \gamma _{B}=\alpha X_{A}^{2}}$
${\displaystyle \alpha ={\frac {\Omega }{RT}}}$

${\displaystyle \gamma >1}$之溶液稱為正偏差溶液

${\displaystyle \gamma <1}$之溶液稱為負偏差溶液，關於偏差請詳見拉午耳定律

## 參考文獻

1. P. Atkins and J. de Paula, Atkins' Physical Chemistry (8th ed. W.H. Freeman 2006) p.149
2. ^ The Term 'Regular Solution'页面存档备份，存于互联网档案馆） Nature, v.168, p.868 (1951)