Solution
Definition and meaning of Solution in chemistry.
A chemical solution is a perfectly uniform mixture containing two or more separate substances. One substance completely dissolves into another substance to create the final mixture. The resulting mixture looks exactly the same throughout its entire total volume.
In more detail
Chemists identify the primary substance in the mixture as the chemical solvent. The solvent acts to dissolve the other added chemical components of the mixture. The substance being actively dissolved into the solvent is known as the solute.
Chemical solutions are considered completely homogeneous down to the microscopic molecular level. Their chemical makeup and physical properties remain identical throughout the entire mixture. Many students mistakenly assume that chemical solutions must always exist as liquids.
In reality, chemical solutions can naturally exist in any common physical state. A solid metal alloy like brass is a perfectly valid solid solution. Breathable air is an excellent example of a naturally occurring gaseous solution.
Liquid solutions using water as the main solvent are called aqueous solutions. The concentration of a solution describes exactly how much solute is currently present. A dilute solution contains a relatively small amount of the dissolved solute.
A concentrated solution holds a much larger amount of the dissolved solute. Every solvent has a maximum physical capacity for dissolving a specific solute. A solution reaching this absolute maximum limit is called a saturated solution.
Adding more solid solute to a saturated solution simply causes it to sink. The extra solid will not dissolve unless you significantly increase the temperature.
Key facts
| Field | General Chemistry |
|---|---|
| Components | Solute (dissolved) and solvent (dissolver) |
| Physical states | Can exist as a solid, liquid, or gas |
| Visual appearance | Completely uniform and homogeneous |
| Saturation limit | The maximum amount of dissolved solute possible |
| Example formula | NaCl(aq) |
When you stir solid sodium chloride (NaCl) into water, it dissolves completely. This specific dissolving process creates a classic and clear aqueous liquid solution. The individual sodium and chloride ions separate from their rigid crystal structure. These separated ions become uniformly distributed among the surrounding liquid water molecules. You can no longer see the original solid salt particles with your eyes. The final salt mixture looks exactly like a glass of pure liquid water.
Frequently asked questions
What makes an aqueous solution different from other solutions?
An aqueous solution specifically uses liquid water as the primary solvent to dissolve the solute.
Can you separate a chemical solution using a standard paper filter?
No, the dissolved solute particles are far too small and will easily pass right through the filter.
Are all liquid mixtures automatically considered to be chemical solutions?
No, mixtures like sand in water are heterogeneous and do not dissolve uniformly like true solutions.