A solution is the combination of two or more substances that are mixed together to form a homogeneous mixture. Solutions are most commonly produced by dissolving one substance in another, such as water dissolving sugar. Solutions can also be created by mixing two or more substances, such as water and alcohol.

The solute is the substance that is dissolved, while the solvent is the liquid that dissolves it. For example, sugar is a solute and water is a solvent. Solutions can be made up of either liquid or solid solutes and liquids or gases as solvents.

Solutions must contain at least one mole of solute for every mole of solvent present in order for them to be considered homogeneous mixtures. The total number of moles present in a given volume of solution is known as concentration (c).

Last modified: October 8, 2022