A Substance Has a Hydrogen Ion Concentration Of $\left[ \mathrm { H } ^ {+ } \right] = 4.0 \times 10 ^ { - 3 }$

Multiple Choice

A substance has a hydrogen ion concentration of $\left[ \mathrm { H } ^ {+ } \right] = 4.0 \times 10 ^ { - 3 }$ M. Find the pH of the substance

A) pH $\approx 7.4$
B) pH $\approx 5.4$
C) pH $\approx 3.4$
D) pH $\approx 4.4$
E) pH $\approx 2.4$