Final answer:
In a solution, solute and solvent exist together in the same phase, determined by the solvent, which is the substance in greater amounts, leading to a homogeneous mixture.
Step-by-step explanation:
In a solution, a solute and a solvent coexist in the same phase. The substance present in the greatest amount, known as the solvent, determines the phase of the solution, while the solute, which is present in a lesser amount, can be in a different physical state before mixing. When dissolved, the solute becomes part of the solvent's phase, resulting in a homogeneous mixture.
For example, in a saltwater solution, the solute (solid NaCl) dissolves in the solvent (liquid water) to form a liquid solution. When we refer to gaseous solutions like air, oxygen can be considered a solute that is mixed with nitrogen, the solvent, both initially in the gaseous phase.