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An<unk>  is a<unk>  in which the solvent is water. It is usually shown in chemical equations as a subscript (aq). The word<unk>  means pertaining to, related to, similar to, or dissolved in water. As water is an excellent solvent as well as naturally abundant, it logically has become a ubiquitous solvent in chemistry.
Substances that do not dissolve well in water are called hydrophobic ('water fearing') whereas those that do are known as hydrophilic ('water-loving'). An example of a hydrophilic substance would be the sodium chloride (ordinary table salt). Acids and bases are<unk> s, as part of their Arrhenius definitions.
The ability of a substance to dissolve in water is determined by whether the substance can match or exceed the strong attractive forces that water molecules generate between themselves. If the substance lacks the ability to dissolve in water the molecules form a precipitate.<unk> s that conduct electric current efficiently contain strong electrolytes, while ones that conduct poorly are considered to have weak electrolytes. Those strong electrolytes are substances that are completely ionised in water, whereas the weak electrolytes exhibit only a small degree of ionisation in water. Nonelectrolytes are substances that dissolve in water but do not produce any ions.
When performing calculations regarding the reacting of one or more<unk> s, one generally must know the concentration, or molarity, of the<unk> s.<unk>  concentration is given in terms of the form of the solute prior to it dissolving.
Aqueous solution
Liquid
Ionic liquid
Lipodissolve
Inorganic nonaqueous solvent
Protic solvent
Flammable liquid
Molar 