We report the results of a series of ultrasound, Brillouin scattering, and optical heterodyne detectedtransient grating experiments performed on a LiCl, 6H_2Osolution from room temperature down tothe vicinity of its liquid-glass transition, T_g~138 K. Down toT~215K, the supercooled liquidhas a behavior similar to what is expected for supercooled water: its zero frequency sound velocity,C_0, continuously decreases while the corresponding infinite frequency velocity, Coo,sharplyincreases, reflecting the increasing importance of H bonding when temperature is lowered. Below215 K, specific aspects of the solution, presumably related to the role of the Li~+and Cl~-ions, modifythe thermal behavior of C_0, while a βrelaxation process also appears and couples to the soundpropagation. The origin of those two effects is briefly discussed.
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