Answer:
5× the H+ concentration.
Explanation:
On the pH scale, each change in pH by '1' means 10× more hydrogen ions. (pH is a logarithmic scale)
So, for example, a pH of 2 versus a pH of 3 has 10× the concentration of H+ ions.
In this problem, the difference is only '0.5', so the difference would only be 5× more.