How do you know that sodium chloride soluble in water?

Sodium chloride (NaCl) is soluble in water due to its ionic nature. When NaCl is added to water, the polar water molecules interact with the positive sodium ions (Na⁺) and negative chloride ions (Cl⁻), effectively separating and surrounding them. This process, known as hydration, allows the ions to disperse throughout the solution, resulting in the dissolution of the salt. Experimental evidence, such as observing the clear solution formed when NaCl is mixed with water, further confirms its solubility.