Accepting that you're utilizing NaOH answer for its essential properties in corrosive/base science, I can expect that pH is of significance. When you have an institutionalized arrangement of say 1M (molar) focus NaOH arrangement and you put it into a dry burette to do a titration or something, you are expecting that the arrangement has a 1 mol of NaOH for each one liter of arrangement (molarity = mols/liters).