Aqueous
Definition and meaning of Aqueous in chemistry.
Aqueous describes a solution in which water is the primary solvent. An aqueous solution forms when a substance is dissolved in water to create a homogeneous mixture.
In more detail
Water is an excellent universal solvent due to its highly polar nature, its molecules possess distinct positive and negative regions that interact effectively with dissolved ions and polar molecules. Most chemical reactions occurring in biological systems, laboratories, and industrial processes take place in aqueous solutions, making water one of the most important media in chemistry. The term originates from the Latin word "aqua," meaning water. In chemical equations, aqueous solutions are specifically denoted with the symbol (aq) placed after a chemical formula to indicate that a substance exists in a water-based solution rather than as a pure solid, liquid, or gas.
Key facts
| Field | General Chemistry |
|---|---|
| Solvent | Water (H2O) |
| Symbol in equations | (aq) |
| Etymology | From Latin 'aqua' (water) |
When sodium chloride (table salt) dissolves in water, it forms an aqueous solution of sodium chloride represented as NaCl(aq), which is chemically similar to the saltwater found in the ocean.
Frequently asked questions
What does '(aq)' mean in a chemical equation?
(aq) is the designation used in chemical equations to indicate that a substance is dissolved in water as an aqueous solution, distinguishing it from solid (s), liquid (l), or gas (g) states.
Why is water such an effective solvent for aqueous solutions?
Water's polar structure, with positive and negative regions, allows it to dissolve many ionic and polar compounds by surrounding and separating dissolved particles, facilitating both dissolution and ionization.