Answer: The lower the pH of the solution
Explanation: The ph scale is a scale ranging from 0 to 14 that determines how acidic or basic a solution is. A solution with a pH of 7 is considered neutral, with pure water being an example of such a solution. Any solution with a pH lower than 7 is considered acidic, while any solution with a pH higher than 7 is considered basic/alkaline.
The acidity or alkalinity of a solution is based on the concentration of H+ and OH- molecules available in the solution. H+ molecules increase the acidity of a solution, thereby lowering its pH. OH- molecules increase the alkalinity of a solution, thereby increasing pH.
Thus, the lower the pH of a solution, the more acidic the solution is.