If Acid Rain Has Lowered the PH of a Particular

Multiple Choice

If acid rain has lowered the pH of a particular lake to pH 4.0, which of the following statements about this lake is true?

A) The hydrogen ion concentration is 1 × 10-10 moles per liter of lake water.
B) The hydrogen ion concentration is 4.0 moles per liter of lake water.
C) The hydrogen ion concentration is 1 × 104 moles per liter of lake water.
D) The hydroxyl ion concentration is 1 × 10-10 moles per liter of lake water.
E) The hydroxyl ion concentration is 1 × 10-4 moles per liter of lake water.