式中k_s为盐析常数,c_s为盐的浓度,分别为非电解质和盐在无限稀释溶液中的偏摩尔体积,V_s为盐在液体状态下的摩尔体积,β_o为水的压缩系数,p_e为盐溶于水而产生的有效压力。此式推导过程中所用的极限条件为V_n→0,因此(1)式仅能用在极小的非电解质分子上,对于苯及苯的衍生物讲,K_s计算值约为实验值的2～3倍。当非电解质体积较大时,Mc- Where k_s is the salting-out constant, c_s is the salt concentration, respectively the partial molar volume of the non-electrolyte and salt in the infinite dilute solution, V_s is the molar volume of the salt in the liquid state, β_o is the compressibility of water, p_e is Salts dissolve in water and produce effective pressure. The limit condition used in this derivation is V_n → 0, so equation (1) can only be used on very small non-electrolyte molecules. For the derivatives of benzene and benzene, the calculated K_s is about 2 ~ 3 times. When the non-electrolyte volume is larger, Mc-