Question

pH is the measure of the hydroxide ion activity in a solution. True or False?

Answer 1

I would say false. pH is defined by the concentration of hydrogen ions in a solution, although this is inversely proportional to the concentration of hydroxide ions in the same solution.

pH is the -log[H+] (negative log of the hydrogen ion concentration).

If you want to look at hydroxide ions, there is a measure called the pOH, which is -log[OH-] (negative log of the hydroxide ion concentration).

The pH and pOH of a solution always add up to 14.

eg a solution with pH2 has a pOH of 12

Answer 2

thanks !