A strong acid is an acid that is completely dissociated or ionized in an aqueous solution. It is a chemical species with a high capacity to lose a proton, H+. In water, a strong acid loses one proton, which is captured by water to form the hydronium ion:
HA(aq) + H2O → H3O+(aq) + A−(aq)
H2SO4 is a strong acid because it can give H+ ions easily.
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