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.

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water