If the pH value of an acidic solution increases but remains below seven, what does it mean?

Correct answer: The solution became less acidic but is still acidic

On the pH scale, values below 7 indicate acidity, while a higher pH within that range indicates lower hydrogen-ion concentration and therefore weaker acidity. For example, a change from pH 3 to pH 5 means the solution is less acidic, but pH 5 is still below 7. It has not become basic, and ions have not vanished.