Answer: solute, solvent
Explanation: Solute is the substance which is present in smaller quantity and solvent is the substance which is present in larger quantity.
Thus when solid solute is mixed with the liquid solvent, after the dissolution of the former, it will change its state from solid to liquid but the phase of the solvent is kept the same.
Thus , In a solution, the substance that changes phase is the solute, while the substance that does not change phase is the solvent.
