Here's why:

* Brønsted-Lowry Acid: A Brønsted-Lowry acid is a substance that donates a proton (H⁺). Sulfuric acid readily donates two protons, making it a strong diprotic acid.

* Brønsted-Lowry Base: A Brønsted-Lowry base is a substance that accepts a proton. Sulfuric acid does not accept protons, it donates them.

Example:

When sulfuric acid reacts with water, it donates a proton to water, forming the hydronium ion (H₃O⁺) and the bisulfate ion (HSO₄⁻):

H₂SO₄ + H₂O → H₃O⁺ + HSO₄⁻

This reaction demonstrates sulfuric acid acting as a Brønsted acid by donating a proton.