From the images, hydrochloric acid is a strong acid because it dissociates completely in water to produce hydrogen and chloride ions.
What is an acid?
Given the Arrhenius definition of an acid, an acid is any substance that produces hydrogen ion in solution as its only positive ion when dissolved in solution. We know that that acids could be strong or weak. Acids could also be organic or mineral. In this later classification, acetic acid is an organic acid while hydrochloric acid is a mineral acid.
With is said, let us now examine each of the beakers. We can see from each of the beakers that the beaker that contains the hydrochloric acid has the acid molecule completely dissociated to hydrogen ions and chloride ions.
In the other beaker that contains the acetic acids, there are only a few of the acetic acid molecules that have dissociated into hydrogen ion and the acetate ion.
As such, it is clear that hydrochloric acid is a strong acid because it dissociates completely in water to produce hydrogen and chloride ions.
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