Which of the following would decrease the ph level of an acidic solution? (2 points) adding a base to the acid increasing the concentration of hydroxide ions decrease the concentration of hydronium ions increasing the number of hydrogen ions

increasing the number of hydrogen ions.

Explanation:

pH is a measure of the acidity or alkalinity of a solution.

pH = -log[H⁺].

The presence of H⁺ is the responsible of the acidity of the solution.As the concentration of H⁺ increases, the acidity of the solution increases and so, pH decreases.So, the right choice is: increasing the number of hydrogen ions.