Considering the tdefinition of base according to the Arrhenius Theory and to the Brønsted-Lowry Theory, NH₃ is a Brønsted-Lowry base but not an Arrhenius base.
According to the Arrhenius Theory, a base is any substance that, when dissolved, releases hydroxyl ions (OH⁻). Bases are also known as alkalis, because when they dissociate and release the hydroxyl groups, the pH of the solutions increases, that is, the solution becomes alkaline.
According to the Brønsted-Lowry Theory, a base is a substance capable of accepting protons (H⁺) in solution.
According to Arrhenius Theory, bases are species that must contain hydroxide ions, OH- (also called hydroxyl anions).
Thus, bases that do not contain hydroxide are not classified as Arrhenius bases.
Finally, the correct answer is option D. NH₃ is a Brønsted-Lowry base but not an Arrhenius base.
Learn more about
Arrhenius Theory:
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Brønsted-Lowry Theory:
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