I'm in College Preparatory Biology in high school(9th grade) and my friend was trying to prove my teacher wrong(it's fun :P). He said that a solute is the same thing as a solvent. According to his dictionary, a solute is a substance that can be dissolved into another substance. Also according to his dictionary, a solvent is a substance that can dissolve anyother substance. My friend looked up dissolve and it said "the act of changing the purity of a substance by causing it to pass into another substance" My friend argued that if you pour Kool-Aid into water, the Kool-Aid would be the solute, and the water would be the solvent, right? If you pour water into the Kool-Aid, however, the water would be the solute, and the Kool-Aid would be solvent. So Kool-Aid = Solute or Solvent and Water = Solute or Solvent.