Which of the following solutions has the greatest concentration of hydroxyl ions [OH-]? 14:39 Biology Chapter 3 Which of the following solutions has the greatest concentration of hydroxyl ions [OH-]? A) lemon juice at pH 2 B) vinegar at pH 3 C) tomato juice at pH 4 D) urine at pH 6 E) seawater at pH 8 Answer: E) seawater at pH 8 Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+