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The results of studying the physical properties of a deep eutectic solvent based on choline chloride and sulfosalicylic acid have been presented. A phase diagram for this two-component mixture has been constructed, and the dependences of its density and refractive index on temperature have been studied for the first time. The molar refractivity of the deep eutectic solvent under study has been calculated. The possibility of using this solvent as an extractant for the recovery of metal ions in a solid-liquid system has been evaluated.

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