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Adding salt to water at ambient pressure affects its thermodynamicproperties. At low salt concentration, anomalies such as the density maximumare shifted to lower temperature, while at large enough salt concentration theycannot be observed any more. Here we investigate the effect of salt on ananomaly recently observed in pure water at negative pressure: the existence ofa sound velocity minimum along isochores. We compare experiments andsimulations for an aqueous solution of sodium chloride with molality around$1.2\,\mathrm{mol\,kg^{-1}}$, reaching pressures beyond $-100\,\mathrm{MPa}$.We also discuss the origin of the minima in the sound velocity and emphasizethe importance of the relative position of the temperatures of sound velocityand density anomalies.

Effect of dissolved salt on the anomalies of water at negative pressure