Concept:It is a concept of acid strength that distinguishes completely ionizing acids from weak, partially ionizing acids.
Explanation:A strong acid is defined by complete dissociation into ions in solution.
When hydrochloric acid dissolves in water, it ionizes entirely as:
HCl(aq)→H(aq)++Cl(aq)−This means all
HCl molecules break apart into hydrogen and chloride ions.
In contrast, weak acids like ethanoic acid ions only partially, leaving undissociated molecules in solution.
Therefore, hydrochloric acid is classified as a strong acid because of this complete ionization.
Answer:B. ionizes completely.