Which of the following solutions has the greatest concentration of hydroxyl ions [OH-]?

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


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