Acids, Bases, And Salts Practice Test

Under Arrhenius theory, a base in water yields which ions?

OH- ions H3O+ ions H+ ions NH4+ ions

Correct Answer:

OH- ions

Explanation:

Under Arrhenius theory, bases are substances that increase the concentration of hydroxide ions in an aqueous solution. When a base dissolves, it releases OH- into the water, as in NaOH ⇌ Na+ + OH-. Even bases like ammonia, which don’t contain OH- themselves, raise OH- levels by reacting with water: NH3 + H2O ⇌ NH4+ + OH-. This increase in hydroxide ions is what makes the solution basic. Hydronium ions (H3O+) are produced by acids, not bases, in water, and free H+ isn’t present as a separate species in solution. So the ion yielded by a base in water is hydroxide, OH-.

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