The emfs of cells without-junction Pt,H~2(g,p)│HCl(m~E)│AgCl-Ag Pt,H~2(g,p)│HCl(m~E),GL(m~N)│AgCl-Ag have been measured at 10 degree intervals from 278.15 to 318.15K, where GL refers to glycerol, m~E=0.005～0.1mol·kg^-^1, m~N=0.4～1.0mol·kg^-^1. The emf data were used to calculate salting constant k~s for HCl-GL-H~2O system and thermodynamic parameters of interactions, f~EN (g~EN, h~EN, s~EN and C~p~,~E~N) between HCl and GL in water. It has been showed that k~s＞0, g~E~N＞0, h~E~N＞0, s~E~N＞0 and C~p~,~E~N＜0. The minimum in k~s is 0.0076kg·mol^-^1 at 353K. f~E~N values of HCl-GL are smaller than that of HCl-PG (1,2-propanediol). The signs of the pair parameters and the temperature dependence of them have been interpreted by the model of structural interaction and the group-additivity principle.

Key words: HYDROCHLORIC ACID, ELECTROMOTIVE FORCES, GLYCEROL, SALT EFFECT, THERMODYNOMICS PARAMETER