Influence of salts of 1,1,2,2-tetrachloroethane on the acidity function of the solutions of methanesulfonic acid

The influence of salts CH3SO3Na and/or CH3SO3Bu4N on the acidity function H-0 of methanesulfonic acid (MSA) and its solutions in water, N,N-dimethylformamide (DMF) in mixtures of methanesulfonic acid-N,N-dimethylformamide MSA-DMF <= 1 and ethyl acetate (EA) in a mixture of methane-sulfonic acid-ethyl acetate MSA/EA (1 : 1) and 1,1,2,2-tetrachloroethane (TCE) on H-0 of methanesulfonic acid (MSA) and its mixtures with N,N-dimethylformamide (DMF), 2-pyrrolidine (Pyr) and ethyl acetate (EA) with the ratios of MSA: DMF equal to 1 : 1 and 2 : 1, MSA: Pyr (2 : 1) and MSA: EA, equal to 2 : 1, 1 : 1, and 1 : 2 is investigated by the indicator method at 25 degrees C. It is revealed that a change in the acidity of the solutions of MSA in the aprotic solvents can occur as a result of the influence of salts both on the equilibrium composition of the nascent complexes and on their ionizing ability (both of these factors change acidity on addition of salts to the mixture of MSA-EA (1 : 1)). An explanation is proposed why CH3SO3Na and CH3SO3Bu4N influence differently on the acidity of aqueous solutions of MSA. It is established that in the solutions of (TCE) the ionizing ability of MSA and its complexes with DMF, Pyr and EA, which have different degree of the proton transfer (K-Ti), depends on the concentration ratio of MSA: TCE and (K-Ti) : TCE.