Compared to a solution with a pH of 7, a solution with a pH of 4 is
A. more acidic and has a 300-fold increase in [H+].
B. more basic and has a 300-fold decrease in [H+].
C. more basic and has a 1,000-fold increase in [H+].
D. more acidic and has a 1,000-fold increase in [H+].
E. more basic and has a 300-fold increase in [H+].
Answer: D
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