35℃下硝酸银在甲醇混合溶剂中溶解度的研究

The Solubility of Silver Nitrate in Mixed Solvents of Methanol

本文报道了在308.15K下AgNO_3在甲醇一环已烷和甲醇一四氯化碳混合溶剂中的溶解度,其数据可用式(1)表示log(S_0/S_m)=k X (1) 同时给出了该温度下AgNO_3在甲醇一苯和甲醇一甲苯混合溶剂中的溶解度,其数据用式(2)表示log(S_0/S_m)=k′X^(1/a) (2)式中S_0和S_m分别是AgNO_3在纯甲醇和混合溶剂中的溶解度,X是混合溶剂中第二组分溶剂的摩尔分数,k,k′是经验常数。按照公式n_++n=-(log S_0/S_m+log y_+~0/y_±)/logφ(3)计算AgNO_3在甲醇一环已烷和甲醇一四氯化碳中的正负离子溶剂化数之和n+ +n(?),式中φ_p是甲醇在混合溶剂中的体积分数,y_+~0,y_±分别是AgNO_3在纯甲醇和混合溶剂中的平均离子活度系数。

This paprer reports our measurements of the solubility of AgNO_3 in the mixture of methanol -cycloh exane and-carbontetraehloride at 308.15K. These data can be expressed bylog S_0/S_m=kx (1)We else measured solubility of AgNO_3 in the mixtures of methanol-benzene, -toluene at 308.15K. These data can be expressed bylog S_0/S_m=k'x^(1/a) (2)where S_0 and S_m are the solubilities of AgNO_3 in pure methanol and mixed solvents, respectively, X is the mole fraction of other components in mixed solvents, k, k' and a is empirical constants.When equation (1) is right, the solvation number of AgNO_3 in methanol-cyclohexane, -carbonte-tracuioride may be interpreted according to the equation (3):n+ +n- =-log (S_0/S_m)/log φ_p+log (y_±~0/y_±)/log φ_p (3)where n+ + n- is the sum of solvation number of positive and negntive ions, φ_p is the volume fract on of methanol in the mixed solvents, y_±~0 and y_± are activity coefficient of AgNO_3 in pure methanol and mixed solvents; respeetively.