An aqueous solution of a salt is known as brine. The salt is:

Brine is most commonly defined as a high-concentration solution of salt in water, specifically referring to sodium chloride (NaCl) [1][4]. While the term can technically apply to other concentrated salt solutions like calcium chloride or potassium chloride in industrial contexts such as drilling or refrigeration, in general chemistry and common usage, brine refers to an aqueous solution of common salt (sodium chloride) [1][4]. Sodium chloride is the primary constituent of seawater, making up over 77% of its dissolved mineral matter [3][4]. It is an essential ionic compound formed by the chemical combination of sodium and chlorine [1]. Brine solutions are widely used in food preservation, industrial chemical production (like the chlor-alkali process), and as completion fluids in reservoir operations [3].

Sources

1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 8: Nature of Matter: Elements, Compounds, and Mixtures > 8.3.2 Compounds > p. 124
2. [4] https://www.sciencedirect.com/topics/engineering/brine-solution
3. [3] https://pubchem.ncbi.nlm.nih.gov/compound/Sodium-Chloride