The physicochemical properties of aqueous solutions of sodium alkanesulfonates. Apparent molar volumes, viscosity B coefficients, heats of solution, and surface tensions.
スポンサーリンク
概要
- 論文の詳細を見る
The apparent molar volumes, viscosity <I>B</I> coefficients, heats of solution, and surface activity of sodium alkanesulfonates (RSO<SUB>3</SUB>Na, methyl to hexyl) in water were measured. The limiting apparent molar volumes at 25 °C increase with the number of carbon atoms in the alkyl chain; the increment per methylene group is about 16 cm<SUP>3</SUP>mol<SUP>−1</SUP>. The viscosity <I>B</I> coefficients of MeSO<SUB>3</SUB>Na and EtSO<SUB>3</SUB>Na increase with the temperature, while those of <I>n</I>-BuSO<SUB>3</SUB>Na decrease with an increase in the temperature. The changes in heat capacity for dissolution in water, Δ<I>C</I><SUB>p</SUB><SUP>o</SUP>, as calculated from the heats of solution at 15, 25, and 35 °C, were negative for MeSO<SUB>3</SUB>Na and EtSO<SUB>3</SUB>Na, while the Δ<I>C</I><SUB>p</SUB><SUP>o</SUP> values for <I>n</I>-PrSO<SUB>3</SUB>Na and higher homologs were positive. MeSO<SUB>3</SUB>Na raises the surface tension of water, while EtSO<SUB>3</SUB>Na and higher homologs reduce it. The structural changes in the solvent water upon the dissolution of sodium alkanesulfonates are discussed in comparison with those of sodium alkyl sulfates previously reported.
- 公益社団法人 日本化学会の論文