Which of the Following Solutions Is Acidic?
A) $\left[ \mathrm { H } ^ { + } \right] = 4.5 \times 10 ^ { - 9 }$

Which of the following solutions is acidic?

A) $\left[ \mathrm { H } ^ { + } \right] = 4.5 \times 10 ^ { - 9 }$
B) $\left[ \mathrm { H } ^ { + } \right] = 2.6 \times 10 ^ { - 5 }$
C) $\left[ \mathrm { H } ^ { + } \right] = 3.8 \times 10 ^ { - 8 }$
D) $\left[ \mathrm { H } ^ { + } \right] = 8.5 \times 10 ^ { - 9 }$
E) $\left[ \mathrm { H } ^ { + } \right] = 6.6 \times 10 ^ { - 12 }$