Strong acids produce more hydronium ions (H₃O⁺) than weak acids at the same concentration.

Here's why:

* Strong acids completely ionize in solution, meaning they donate all their hydrogen ions (H⁺) to water molecules, forming hydronium ions.

* Weak acids only partially ionize, meaning they donate a small fraction of their hydrogen ions.

Therefore, even at the same concentration, a strong acid will have a much higher concentration of hydronium ions, leading to a lower pH (more acidic) than a weak acid.