In a homogeneous solution, the solute particles (sodium hydroxide) are completely and evenly distributed throughout the solvent (water), forming a single phase. The solute particles are dissolved at the molecular or ionic level, and the solution has a uniform composition throughout.
Unlike mixtures, where the components are physically combined and can be easily separated, the components in a homogeneous solution are chemically combined at the molecular level. The solute particles interact with the solvent molecules, forming a stable solution.
Therefore, a solution of sodium hydroxide is considered a homogeneous solution, not a mixture.
