What is the ph scale used for? a. measures hydroxide ion concentration (strength of the acid or base) b. measures hydronium ion concentration (strength of the acid or base)

The correct answer is a. Measures hydroxide ion concentration (strength of the acid or base) because when you look at the scientific definition of the use of a PH scale it says... "Acidity is the amount of hydrogen protons present in a solution and basicity is the amount of hydroxide ions present in a solution. The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14. A pH of 7 is neutral."

No because scientist are still changing there mines today so they are not correct to this day