The term used for the physical state of a solution reactant or product dissolved in water is aqueous, represented by the symbol (aq).

For example, in the reaction:

NaCl(s) + H₂O(l) → Na⁺(aq) + Cl⁻(aq)

The sodium chloride (NaCl) is a solid (s) before dissolving, and the sodium ions (Na⁺) and chloride ions (Cl⁻) are in the aqueous state (aq) after dissolving in water.