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Aqueous refers to a solution in water.
A more exact definition is a solution in which the solute (the substance dissolved) initially is a liquid or a solid and the solvent is water.
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Aqueous solutions fall into three general categories based on how well they conduct electricity:
Caution: do not interpret this language to suggest that it is safe to work with electricity around water! Such work involves special training, safeguards and precautions.
The term aqueous may appear on an SDS in terms of a special instruction (such as first aid procedures), a particular chemical property, or a chemical incompatibility.
Aqueous solutions are not usually flammable, but may be able to carry toxic materials into your body through skin contact or ingestion.
Be careful with terminology. A solution of ammonia gas (NH3) in water is often called ammonium hydroxide, NH4OH, ammonia water, or simply ammonia. Do not confuse this aqueous solution with ammonia gas (anhydrous ammonia)!
See also: concentration, electrolyte, solubility, solution, solvent, water reactive.
Additional definitions from Google and OneLook.
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