The water in a 150-mL flask is poured into a beaker that contains 600 mL of ethyl alcohol. Which substance is the solvent in this mixture?

The solvent is generally the substance present in the greater amount in a solution. There are 600 mL of ethyl alcohol and only 150 mL of water, so ethyl alcohol is the solvent. Its volume, not its density, determines the answer here.

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