Which statement best describes a strong electrolyte?

A strong electrolyte is defined by its ability to completely dissociate into ions when dissolved in solution. This characteristic is crucial because it enables the solution to conduct electricity effectively, as the presence of free-moving ions allows for charge transfer. Strong electrolytes include substances like sodium chloride and potassium nitrate, which dissolve readily and ionize fully.

In contrast, a weak electrolyte only partially dissociates in solution, meaning that not all of the solute molecules break into ions, resulting in a lower concentration of ions available for electrical conductivity. Additionally, some substances may form precipitates instead of forming a usable ionic solution, which does not happen with strong electrolytes. A solution that does not conduct electricity indicates that there are insufficient free ions present, a characteristic that is opposite to that of a strong electrolyte. Thus, option A accurately captures the fundamental behavior of strong electrolytes in aqueous solutions.