Properties of aqueous methanesulfonic acid: complex index of refraction and surface tension

摘要

The complex index of refraction of aqueous methanesulfonic acid (MSA) at room temperature and at concentrations of 1-70 wt. % is presented. The complex index of refraction is obtained in the entire wave-number region from the mid infrared to the ultraviolet-visible regions. An analysis of the infrared spectra reveals a single absorption band, which makes it possible to identify MSA in aqueous H_(2)SO_(4). The surface tension of 1-99-wt. % aqueous MSA from room temperature to ～263 K, depending on the concentration of MSA, is reported. A polynomial parameterization of the surface tension in terms of acid weight fraction and temperature is presented.