複選題5. Which of the following statements is true? (A) When a base is dissolved in water, the lowest possible pH of the solution is 7.0. (B) When an acid is dissolved in water, the lowest possible pH is 0. (C) A strong acid solution will have a lower pH than a weak acid solution. (D) A 0.0010 M Ba(OH)2 solution has a pOH that is twice the pOH value of a 0.0010 M KOH solution.