Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxyl ion concentration of this lake?
A) 1 × 10?¹° mol of hydroxyl ion per liter of lake water
B) 1 × 10?4 mol of hydroxyl ion per liter of lake water
C) 10.0 M with regard to hydroxyl ion concentration
D) 4.0 M with regard to hydroxyl ion concentration
E) 1 × 10?4 mol of hydroxyl ion per liter of lake water and 4.0 M with regard to hydrogen ion concentration
Answer: A
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